Template:Networking rutos manual firewall: Difference between revisions

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The <b>Inter-zone forwarding</b> options control the forwarding policies between the currently edited zone and other zones.  

[[File:Networking_rutx09_rutx11_manual_firewall_general_settings_zones_inter-zone_forwarding_v1.png]]

[[File:Networking_rutx08_rutx10_manual_firewall_general_settings_zones_inter-zone_forwarding_v1.png]]

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You will be redirected to that rule's configuration page:

[[File:Networking_rutx_manual_firewall_port_forwards_configuration_v1.png]]

[[File:Networking_rutx08_10_manual_firewall_port_forwards_configuration_v1.png]]

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The <b>Reset</b> button resets the custom rules field to its default state.

==NAT helpers==

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===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.

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     <tr>

       <td>SYN flood rate</td>

       <td>Set rate limit (packets per second) for SYN packets above which the traffic is considered flooded</td>

     </tr>

     <tr>

     <td>SYN flood burst</td>

         <td>Set burst limit for SYN packets above which the traffic is considered flooded if it exceeds the allowed rate</td>

     </tr>

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.  

     <tr>

     <td>Limit</td>

         <td>Maximum ICMP echo-request number during the period</td>

     </tr>

     <tr>

     <td>Limit burst</td>

         <td>Indicate the maximum burst before the above limit kicks in</td>

     </tr>

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.

     <tr>

     <td>Limit</td>

         <td>Maximum SSH connections during the set period</td>

     </tr>

     <tr>

     <td>Limit burst</td>

         <td>Indicate the maximum burst before the above limit kicks in</td>

     </tr>

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.

     <tr>

     <td>Limit</td>

         <td>Maximum HTTP connections during the set period</td>

     </tr>

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.

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     <td>Limit</td>

         <td>Maximum HTTPS connections during the set period</td>

     </tr>

==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.

     <tr>

       <td>Enable</td>

       <td>Toggles the function ON or OFF</td>

     </tr>

     <tr>

       <td>Interval</td>

       <td>Time interval in seconds in which port scans are counted</td>

     </tr>