View source for RUT240 Firewall

==Summary==

{{Template: webui_network_firewall_summary}}

==General Settings==

{{Template: webui_network_firewall_general_settings}}


[[Image:Network firewall general general.PNG]]


<table class="nd-mantable">
    <tr>
        <th>field name</th>
       	<th>value</th>
       	<th>description</th>
    </tr>
    <tr>
      	<td>Drop invalid packets</td>
       	<td>yes {{!}} no; Default: '''no'''</td>
       	<td>A “Drop” action is performed on a packet that is determined to be invalid</td>
    </tr>
    <tr>
      	<td>Input</td>
       	<td>Reject {{!}} Drop {{!}} Accept; Default: '''Accept'''</td>
       	<td>Action<span style="color: #0054A6;">'''*'''</span> that is to be performed for packets that pass through the Input chain</td>
    </tr>
    <tr>
    	<td>Output</td>
        <td>Reject {{!}} Drop {{!}} Accept; Default: '''Accept'''</td>
        <td>Action<span style="color: #0054A6;">'''*'''</span> that is to be performed for packets that pass through the Output chain</td>
    </tr>
    <tr>
    	<td>Forward</td>
        <td>Reject {{!}} Drop {{!}} Accept; Default: '''Reject'''</td>
        <td>Action<span style="color: #0054A6;">'''*'''</span> that is to be performed for packets that pass through the Forward chain</td>
    </tr>
</table>
'''*When a packet goes through a firewall chain it is matched against all the rules of that specific chain. If no rule matches said packet, an according Action (Drop, Reject or Accept) is performed'''

'''Accept''' – packet gets to continue down to the next chain

'''Drop''' – packet is stopped and deleted

'''Reject''' – packet is stopped, deleted and, differently from Drop, an ICMP packet containing a message of rejection is sent to the source of the dropped packet

===DMZ===
----
By enabling '''DMZ''' for a specific internal host (e.g., your computer), you will expose that host and its services to the router’s WAN network (i.e. – the Internet).


[[Image:Network firewall general dmz.PNG]]


<table class="nd-mantable">
    <tr>
        <th>field name</th>
       	<th>value</th>
       	<th>description</th>
    </tr>
    <tr>
      	<td>Source zone</td>
       	<td>yes {{!}} no; Default: '''no'''</td>
       	<td>Toggles DMZ On or Off</td>
    </tr>
    <tr>
      	<td>DMZ host IP address</td>
       	<td>ip; Default: " "</td>
       	<td>Internal host to which the DMZ rule will be applied </td>
    </tr>
</table>

===Zone Forwarding===
----
A zone section groups one or more interfaces and serves as a source or destination for forwardings, rules and redirects. The '''Zone Forwarding''' section allows you to configure these forwardings.


[[Image:Network firewall general zone.PNG]]


<table class="nd-mantable">
    <tr>
        <th>field name</th>
       	<th>value</th>
       	<th>description</th>
    </tr>
    <tr>
      	<td>Source zone</td>
       	<td><span style="background:#9DB6BA"> gre: gre tunnel </span>  |  <span style="background:#FD9589"> hotspot: </span>  {{!}}  <span style="background:#CEF58F"> l2tp: l2tp </span>  {{!}}  <span style="background:#9BEAC3"> pptp: pptp </span>  {{!}}  <span style="background:#96EBE8"> vpn: openvpn </span>  {{!}}  <span style="background:#D0E1EF"> wan: ppp </span>  {{!}}  <span style="background:#DDDDDD"> lan: lan </span></td>
       	<td>The source zone from which data packets will redirected from</td>
    </tr>
    <tr>
      	<td>Destination zones</td>
       	<td><span style="background:#9DB6BA"> gre: gre tunnel </span>  |  <span style="background:#FD9589"> hotspot: </span>  {{!}}  <span style="background:#CEF58F"> l2tp: l2tp </span>  {{!}}  <span style="background:#9BEAC3"> pptp: pptp </span>  {{!}}  <span style="background:#96EBE8"> vpn: openvpn </span>  {{!}}  <span style="background:#D0E1EF"> wan: ppp </span>  {{!}}  <span style="background:#DDDDDD"> lan: lan </span></td>
       	<td>The destination zone to which data packets will be redirected to</td>
    </tr>
    <tr>
    	<td>Default forwarding action</td>
        <td>Reject {{!}} Drop {{!}} Accept</td>
        <td>Action to be performed with the redirected packets</td>
    </tr>
</table>

==Port Forwarding==

The '''Port Forwarding''' window is used to set up servers and services on local LAN machines. Below is an overview of Port Forwarding default rules.


[[Image:Network firewall port forwarding.PNG]]

===New Port Forward Rule===
----
If none of the default rules suit your purposes, you can create custom rules using the '''New Port Forward Rule''' tab.

[[Image:Network firewall port forwarding new.PNG]]

<table class="nd-mantable">
    <tr>
        <th>field name</th>
       	<th>value</th>
       	<th>description</th>
    </tr>
    <tr>
      	<td>Name</td>
       	<td>string; Default: " "</td>
       	<td>Name of the rule, used purely for easier management purposes</td>
    </tr>
    <tr>
      	<td>Protocol</td>
       	<td>TCP+UDP {{!}} TCP {{!}} UDP {{!}} ICMP {{!}} -- custom --; Default: '''TCP+UDP'''</td>
       	<td>Type of protocol of incoming packet</td>
    </tr>
    <tr>
    	<td>External port</td>
        <td>integer [0..65535] {{!}} range of integers [0..65534] - [1..65535]; Default: " "</td>
        <td>Traffic will be forwarded from this port on the WAN network</td>
    </tr>
    <tr>
    	<td>Internal IP address</td>
        <td>ip; Default: " "</td>
        <td>The IP address of the internal machine that hosts some service that you want to access from the outside</td>
    </tr>
    <tr>
    	<td>Internal port</td>
        <td>integer [0..65535] {{!}} range of integers [0..65534] - [1..65535]; Default: " "</td>
        <td>The rule will redirect the traffic to this port on the internal machine</td>
    </tr>
</table>

Once you have submitted the required information, click the '''Add''' button located in the New Port Forward Rule tab.

====Port Forward Rule Configuration====
----
To configure a Port Forward rule, click the '''Edit''' button located next to it. Below is a continuation of the previous New Port Forward Rule example, where we look at the configuration of the newly created rule.


[[Image:Network firewall port forwarding new configuration.PNG]]


<table class="nd-mantable">
    <tr>
        <th>field name</th>
       	<th>value</th>
       	<th>description</th>
    </tr>
    <tr>
      	<td>Enable</td>
       	<td>yes {{!}} no; Default: '''no'''</td>
       	<td>Toggles a rule ON or OFF</td>
    </tr>
    <tr>
      	<td>Name</td>
       	<td>string; Default: " "</td>
       	<td>The name of the rule. This is used for easier management purposes</td>
    </tr>
    <tr>
    	<td>Protocol</td>
        <td>TCP+UDP {{!}} TCP {{!}} UDP {{!}} ICMP {{!}} -- custom --; Default: '''TCP+UDP'''</td>
        <td>Specifies to which protocols the rule should apply</td>
    </tr>
    <tr>
    	<td>Source zone</td>
        <td> <span style="background:#9DB6BA"> gre: gre tunnel </span>  |  <span style="background:#FD9589"> hotspot: </span>  {{!}}  <span style="background:#CEF58F"> l2tp: l2tp </span>  {{!}}  <span style="background:#9BEAC3"> pptp: pptp </span>  {{!}}  <span style="background:#96EBE8"> vpn: openvpn </span>  {{!}}  <span style="background:#D0E1EF"> wan: ppp </span>  {{!}}  <span style="background:#DDDDDD"> lan: lan </span> ; Default: '''<span style="background:#DDDDDD"> wan: ppp </span>'''</td>
        <td>The source zone from which data packets will redirected from</td>
    </tr>
    <tr>
      	<td>Source MAC address</td>
       	<td>mac; Default: " "</td>
       	<td>Matches incoming traffic from these MACs only</td>
    </tr>
    <tr>
      	<td>Source IP address</td>
       	<td>ip; Default: " "</td>
       	<td>Matches incoming traffic from this IP or range of IPs only</td>
    </tr>
    <tr>
    	<td>Source port</td>
        <td>integer [0..65535] {{!}} range of integers [0..65534] - [1..65535]; Default: " "</td>
        <td>Matches incoming traffic originating from the given source port or port range on the client host only</td>
    </tr>
    <tr>
    	<td>External IP address</td>
        <td>ip; Default: " "</td>
        <td>Matches incoming traffic directed at the given IP address only</td>
    </tr>
    <tr>
      	<td>External port</td>
       	<td>integer [0..65535] {{!}} range of integers [0..65534] - [1..65535]; Default: " "</td>
       	<td>Specifies the external port, i.e., the port from which the third party is connecting </td>
    </tr>
    <tr>
      	<td>Internal zone</td>
       	<td><span style="background:#9DB6BA"> gre: gre tunnel </span>  |  <span style="background:#FD9589"> hotspot: </span>  {{!}}  <span style="background:#CEF58F"> l2tp: l2tp </span>  {{!}}  <span style="background:#9BEAC3"> pptp: pptp </span>  {{!}}  <span style="background:#96EBE8"> vpn: openvpn </span>  {{!}}  <span style="background:#D0E1EF"> wan: ppp </span>  {{!}}  <span style="background:#DDDDDD"> lan: lan </span> ; Default: '''<span style="background:#DDDDDD"> lan: lan </span>'''</td>
       	<td>Specifies the internal zone, i.e., the zone where the incoming connection will be redirected to</td>
    </tr>
    <tr>
    	<td>Internal IP address</td>
        <td>ip; Default: " "</td>
        <td>Specifies the internal IP address, i.e., the IP address to which the incoming connection will be redirected to</td>
    </tr>
    <tr>
    	<td>Internal port</td>
        <td>integer [0..65535] {{!}} range of integers [0..65534] - [1..65535]; Default: " "</td>
        <td>Specifies the internal port, i.e., the port to which the incoming connection will be redirected to</td>
    </tr>
    <tr>
      	<td>Enable NAT loopback</td>
       	<td>yes {{!}} no; Default: '''no'''</td>
       	<td>NAT loopback enables your local network (i.e., behind your router/modem) to connect to a forward-facing IP address (such as 208.112.93.73) of a machine that it also on your local network</td>
    </tr>
    <tr>
      	<td>Extra arguments</td>
       	<td>string; Default: " "</td>
       	<td>Passes additional arguments to iptables. '''Use with care!'''</td>
    </tr>
</table>

==Traffic Rules==

The '''Traffic Rules''' page contains a more generalized rule definition. With it you can block or open ports, alter how traffic is forwarded between LAN and WAN and many other things.


[[Image:Network firewall trafic rules.PNG]]


<table class="nd-othertables">
    <tr>
        <th style="width: 250px"></th>
       	<th style="width: 1450px"></th>
    </tr>
    <tr>
      	<td>Name</td>
       	<td>Name of the rule, used purely for easier management purposes</td>
    </tr>
    <tr>
      	<td>Protocol</td>
       	<td>Type of protocol of incoming packet</td>
    </tr>
    <tr>
    	<td>Source</td>
        <td>The source zone from which data packets will redirected from</td>
    </tr>
    <tr>
    	<td>Destination</td>
        <td>Redirect matched traffic to the given IP address and destination port</td>
    </tr>
    <tr>
      	<td>Action</td>
       	<td>Action to be performed with the packet if it matches the rule</td>
    </tr>
    <tr>
    	<td>Enable</td>
        <td>Toggles the rule ON or OFF. If unchecked, the rule will not be deleted, but it also will not be loaded into the firewall</td>
    </tr>
    <tr>
    	<td>Sort</td>
        <td>When a packet arrives, it gets checked for a matching rule. If there are several matching rules, only the first one is applied, i.e., the order of the rule list impacts how your firewall operates, therefore you are given the ability to sort your list however you deem fit</td>
    </tr>
</table>

===Traffic Rule Configuration===
----
To customize a Traffic Rule, click the '''Edit''' button located next to it. This way you can fine tune a rule to near perfection, if you should desire that. The figure below is an example of the "Allow-DHCP-Relay" default rule editing. All rules are configured in an identical manner but with different settings. 


[[Image:Network firewall trafic rules edit.PNG]]


{| class="wikitable"
|+
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | FIELD NAME
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | VALUE
! style="width: 579px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | DESCRIPTION
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Enable
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | yes {{!}} no; Default: '''no'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Turns the rule ON or OFF
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Name
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | string; Default: " "
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | The name of the rule. This is used for easier management purposes
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Restrict to address family
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | IPv4 and IPv6 {{!}} IPv4 only {{!}} IPv6 only; Default: '''IPv4 and IPv6'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Name of the rule, used purely for easier management purposes
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Protocol
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | TCP+UDP {{!}} TCP {{!}} UDP {{!}} ICMP {{!}} -- custom --; Default: '''TCP+UDP'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Specifies to which protocols the rule should apply
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Source zone
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | <span style="background:#9DB6BA"> gre: gre tunnel </span>  |  <span style="background:#FD9589"> hotspot: </span>  {{!}}  <span style="background:#CEF58F"> l2tp: l2tp </span>  {{!}}  <span style="background:#9BEAC3"> pptp: pptp </span>  {{!}}  <span style="background:#96EBE8"> vpn: openvpn </span>  {{!}}  <span style="background:#D0E1EF"> wan: ppp </span>  {{!}}  <span style="background:#DDDDDD"> lan: lan </span> ; Default: '''<span style="background:#DDDDDD"> wan: ppp </span>'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Specifies the external zone, i.e., the zone from which the third party connection will come
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Source MAC address
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | mac; Default: " "
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Specifies the mac address of the external host, i.e., the rule will apply only to hosts that have the MAC addresses specified in this field <br> 
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Source IP address
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | ip; Default: " "
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Specifies the IP address or range of IPs of the external host, i.e., the rule will apply only to hosts that have the IP addresses specified in this field
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Source port
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | integer [0..65535] {{!}} range of integers [0..65534] - [1..65535]; Default: " "
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Specifies the port or range of ports that the external host host will using as their source, i.e., the rule will apply only to hosts that use source ports specified in this field
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | External IP address
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | ip {{!}} ip/netmask {{!}} ANY; Default: '''ANY'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Specifies the external IP address or range of external IPs of the local host, i.e., the rule will apply only to the external IP addresses specified in this field
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | External port
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | integer [0..65535] {{!}} range of integers [0..65534] - [1..65535]; Default: " "
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Specifies the external port, i.e., the port from which the third party is connecting
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Destination zone
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | <span style="background:#9DB6BA"> gre: gre tunnel </span>  |  <span style="background:#FD9589"> hotspot: </span>  {{!}}  <span style="background:#CEF58F"> l2tp: l2tp </span>  {{!}}  <span style="background:#9BEAC3"> pptp: pptp </span>  {{!}}  <span style="background:#96EBE8"> vpn: openvpn </span>  {{!}}  <span style="background:#D0E1EF"> wan: ppp </span>  {{!}}  <span style="background:#DDDDDD"> lan: lan </span> ; Default: '''<span style="background:#DDDDDD"> lan: lan </span>'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Match forwarded traffic to the given destination zone only
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Destination address
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | ip; Default: " "
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" |  Match forwarded traffic to the given destination IP address or IP range only
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Destination port
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | integer [0..65535] {{!}} range of integers [0..65534] - [1..65535]; Default: " "
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Match forwarded traffic to the given destination port or port range only
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Action
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Drop {{!}} Accept {{!}} Reject {{!}} Don't track; Default: '''no'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Action to be taken on the packet if it matches the rule. You can also define additional options like limiting packet volume, and defining to which chain the rule belongs.

'''Don't track''' - connections with the specified parameters will not be monitored by the Firewall, i.e., no other Firewall rules will be applied to the specified configuration 
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Extra arguments
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | string; Default: " "
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Adds extra options (specified in this field) to the rule
|-
|}

===Open Ports On Router===
----
'''Open Ports On Router''' rules can open certain ports and redirect hosts connecting to the router from specified zones to specified ports.


[[Image:Network firewall trafic rules open.PNG]]


{| class="wikitable"
|+
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | FIELD NAME
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | VALUE
! style="width: 579px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | DESCRIPTION
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | NAME
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | string; Default: " "
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | The name of the rule. This is used for easier management purposes. The NAME field auto-filled when port numbers are specified, unless the NAME was specified beforehand by the user
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | PROTOCOL
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | TCP+UDP {{!}} TCP {{!}} UDP {{!}} Other; Default: '''TCP+UDP'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Specifies to which protocols the rule should apply 
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | EXTERNAL PORT
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | integer [0..65535] {{!}} range of integers [0..65534] - [1..65535]; Default: " " 
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Specifies which port should be opened
|-
|}

===New Forward Rule===
----
'''New Forward Rules''' lets you create custom zone forwarding rules


[[Image:Network firewall trafic rules new.PNG]]


{| class="wikitable"
|+
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | FIELD NAME
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | VALUE
! style="width: 579px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | DESCRIPTION
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Name
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | string; Default: " "
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Name of the rule, used purely for easier management purposes
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Source
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | GRE {{!}} HOTSPOT {{!}} L2TP {{!}} LAN {{!}} PPTP {{!}} VPN {{!}} WAN; Default: '''LAN'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Match incoming traffic from selected address family only
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Destination
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | GRE {{!}} HOTSPOT {{!}} L2TP {{!}} LAN {{!}} PPTP {{!}} VPN {{!}} WAN; Default: '''WAN'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Forward incoming traffic to selected address family only
|-
|}

===Source NAT===
----
'''Source NAT''' is a specific form of masquerading which allows fine grained control over the source IP used for outgoing traffic, for example to map multiple WAN addresses to internal subnets.


[[Image:Network firewall trafic rules snat.PNG]]


{| class="wikitable"
|+
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | FIELD NAME
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | VALUE
! style="width: 579px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | DESCRIPTION
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Name
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | string; Default: " "
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Name of the rule, used purely for easier management purposes
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Protocol
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | TCP+UDP {{!}} TCP {{!}} UDP {{!}} Other...; Default: '''TCP+UDP'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Protocol of the packet that is being matched against traffic rules
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Source
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | GRE {{!}} HOTSPOT {{!}} L2TP {{!}} LAN {{!}} PPTP {{!}} VPN {{!}} WAN; Default: '''LAN'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Match incoming traffic from selected address family only
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Destination
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | GRE {{!}} HOTSPOT {{!}} L2TP {{!}} LAN {{!}} PPTP {{!}} VPN {{!}} WAN; Default: '''LAN'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Forward incoming traffic to selected address family only
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | SNAT
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | ip and port [0..65535]; Default: " "
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | SNAT (Source Network Address Translation) rewrites packet's source IP address and port
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Enable
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | yes {{!}} no; Default: '''no'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Toggles the rule ON or OFF
|-
|}

==Custom Rules==

The Custom Rules page provides ultimate freedom in defining your own rules – you can enter them straight into the '''iptables''' program. Just type a rule into the text field ant it will get executed as a Linux shell script. If you are unsure of how to use iptables, we advise that you consult with an expert or check the Internet for manuals, examples and explanations.


[[Image:Network firewall custom rules.PNG]]

==DDOS Prevention==

The '''DDOS Prevention''' page allows you to set up protections from various types of DDOS attacks. You will find information on all of these methods bellow.

===SYN Flood Protection===
----
'''SYN Flood Protection''' allows you to protect yourself from attacks that exploit part of the normal TCP three-way handshake to consume resources on the targeted server and render it unresponsive. Essentially, with SYN flood DDOS, the offender sends TCP connection requests faster than the targeted machine can process them, causing network over-saturation.


[[Image:Network firewall ddos syn.PNG]]


{| class="wikitable"
|+
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | FIELD NAME
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | VALUE
! style="width: 579px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | DESCRIPTION
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Enable SYN flood protection
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | yes {{!}} no; Default: '''yes'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Toggles the rule ON or OFF
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | SYN flood rate
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | integer; Default: '''25'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Set rate limit (packets per second) for SYN packets above which the traffic is considered flooded
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | SYN flood burst
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | integer; Default: '''50'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Set rate limit (packets per second) for SYN packets above which the traffic is considered flooded
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | TCP SYN cookies
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | yes {{!}} no; Default: '''no'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Enable the use of SYN cookies (particular choices of initial TCP sequence numbers by TCP servers)
|-
|}

===Remote ICMP Requests===
----
Some attackers use '''ICMP echo''' request packets directed to IP broadcast addresses from remote locations to generate denial-of-service attacks. You can set up some custom restrictions to help protect your router from ICMP bursts. 


[[Image:Network firewall ddos icmp.PNG]]


{| class="wikitable"
|+
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | FIELD NAME
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | VALUE
! style="width: 579px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | DESCRIPTION
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Enable ICMP requests
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | yes {{!}} no; Default: '''yes'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Toggles the rule ON or OFF
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Enable ICMP requests
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | yes {{!}} no; Default: '''yes'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Toggles ICMP echo-request limit in selected period ON or OFF
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Limit period
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Second {{!}} Minute {{!}} Hour {{!}} Day; Default: '''Second'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Select ICMP echo-request period limit
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Limit
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | integer; Default: '''10'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Maximum ICMP echo-request number during the period
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Limit burst
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | integer; Default: '''5'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Indicate the maximum burst before the above limit kicks in
|-
|}

===SSH Attack Prevention===
----
Prevent SSH (allows a user to run commands on a machine's command prompt without them being physically present near the machine) attacks by limiting connections in a defined period.


[[Image:Network firewall ddos ssh.PNG]]


{| class="wikitable"
|+
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | FIELD NAME
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | VALUE
! style="width: 579px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | DESCRIPTION
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Enable SSH limit
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | yes {{!}} no; Default: '''yes'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Toggles the rule ON or OFF
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Limit period
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Second {{!}} Minute {{!}} Hour {{!}} Day; Default: '''Second'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | The period in which SSH connections are to be limited
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Limit
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | integer; Default: '''10'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Maximum SSH connections during the set period
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Limit burst
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | integer; Default: '''5'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Indicate the maximum burst before the above limit kicks in
|-
|}

===HTTP Attack Prevention===
----
An HTTP attack sends a complete, legitimate HTTP header, which includes a 'Content-Length' field to specify the size of the message body to follow. However, the attacker then proceeds to send the actual message body at an extremely slow rate (e.g. 1 byte/100 seconds.) Due to the entire message being correct and complete, the target server will attempt to obey the 'Content-Length' field in the header, and wait for the entire body of the message to be transmitted, hence slowing it down.


[[Image:Network firewall ddos hhtp.PNG]]


{| class="wikitable"
|+
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | FIELD NAME
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | VALUE
! style="width: 579px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | DESCRIPTION
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Enable HTTP limit
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | yes {{!}} no; Default: '''yes'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Toggles the rule ON or OFF
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Limit period
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Second {{!}} Minute {{!}} Hour {{!}} Day; Default: '''Second'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | The period in which HTTP connections are to be limited
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Limit
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | integer; Default: '''10'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Maximum HTTP connections during the set period
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Limit burst
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | integer; Default: '''10'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Indicate the maximum burst before the above limit kicks in
|-
|}

===HTTPS Attack Prevention===
----
This section allows you to enable protection against '''HTTPS''' attacks, also known as '''man-in-the-middle attacks''' ('''MITM''').

In cryptography and computer security, a man-in-the-middle attack (MITM) is an attack where the perpetrator secretly relays and possibly alters the communication between two parties who believe they are directly communicating with each other. One example of man-in-the-middle attacks is active eavesdropping, in which the attacker makes independent connections with the victims and relays messages between them to make them believe they are talking directly to each other over a private connection, when in fact the entire conversation is controlled by the attacker.


[[Image:Network firewall ddos hhtps.PNG]]


{| class="wikitable"
|+
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | FIELD NAME
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | VALUE
! style="width: 579px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | DESCRIPTION
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Enable HTTPS limit
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | yes {{!}} no; Default: '''yes'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Toggles the rule ON or OFF
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Limit period
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Second {{!}} Minute {{!}} Hour {{!}} Day; Default: '''Second'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | The period in which HTTPS connections are to be limited
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Limit
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | integer; Default: '''10'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Maximum HTTPS connections during the set period
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Limit burst
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | integer; Default: '''10'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Indicate the maximum burst before the above limit kicks in
|-
|}

==Port Scan Prevention==

Port scan attacks scan which of the targeted host's ports are open. Network ports are the entry points to a machine that is connected to the Internet. A service that listens on a port is able to receive data from a client application, process it and send a response back. Malicious clients can sometimes exploit vulnerabilities in the server code so they gain access to sensitive data or execute malicious code on the machine remotely.

===Port Scan===
----
Port scanning is usually done in the initial phase of a penetration test in order to discover all network entry points into the target system. The Port Scan section provides you with the possibility to enable protection against port scanning software. 


[[Image:Network firewall port scan.PNG]]


{| class="wikitable"
|+
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | FIELD NAME
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | VALUE
! style="width: 579px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | DESCRIPTION
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Enable
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | yes {{!}} no; Default: '''yes'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Toggles the function ON or OFF
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Interval
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | integer [10..60]; Default: '''30'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Time interval in seconds in which port scans are counted
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Scan count
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | integer [5..65534]; Default: '''10'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | How many port scans before blocked
|-
|}

===Defending Type===
----
The Defending Type section provides the possibility for the user to enable protections from certain types of online attacks. These include '''SYN-FIN''', '''SYN-RST''', '''X-Mas''', '''FIN scan''' and '''NULLflags''' attacks.


[[Image:Network firewall port scan def.PNG]]


{| class="wikitable"
|+
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | FIELD NAME
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | VALUE
! style="width: 579px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | DESCRIPTION
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | SYN-FIN attack
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | yes {{!}} no; Default: '''no'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Toggles protection from SYN-FIN attacks ON or OFF
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | SYN-RST attack
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | yes {{!}} no; Default: '''no'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Toggles protection from SYN-RST attacks ON or OFF
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | X-Mas attack
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | yes {{!}} no; Default: '''no'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Toggles protection from X-Mas attacks ON or OFF
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | FIN scan
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | yes {{!}} no; Default: '''no'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Toggles protection from FIN scan attacks ON or OFF
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | NULLflags attack
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | yes {{!}} no; Default: '''no'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Toggles protection from NULLflags attacks ON or OFF
|-
|}

==Helpers==

The '''NAT Helpers''' section provides you the option to add firewall exceptions for some VoIP protocols, namely SIP and H.323. In other words, these functions provide a pass-through for VoIP communications between the router's LAN and WAN.

'''Technical explanation:'''

FTP, SIP and H.323 protocols are harder to filter by firewalls since they violate layering by introducing OSI layer 3/4 parameters in the OSI layer 7.
NAT helpers are modules that are able to assist the firewall in tracking these protocols. These helpers create the so-called expectations that can be used to open necessary ports for RELATED connections. For example: FTP, GRE and PPTP helpers are enabled by default.


[[File:Network firewall helpers.png]]


{| class="wikitable"
|+
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | FIELD NAME
! style="width: 250px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | VALUE
! style="width: 579px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | DESCRIPTION
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | H323
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | yes {{!}} no; Default: '''no'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Toggles H323 filtering ON or OFF
|-
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | SIP
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | yes {{!}} no; Default: '''no'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Toggles SIP filtering ON or OFF
|-
|}