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Topology changes
<p style="color:red">The information on this page is updated in accordance with the [https://wiki.teltonika-networks.com/view/FW_%26_SDK_Downloads'''00.07.06.6'''] firmware version .</p>
<p style="color:red">The information on this page is updated in accordance with the [https://wiki.teltonika-networks.com/view/FW_%26_SDK_Downloads'''00.07.06.6'''] firmware version .</p>
=Introduction=
=Introduction=
Normally, OpenVPN Client access is controlled by enabling or disabling the Client to Client button in OpenVPN Servers configuration, however, at times, more granular control is required. In this example, we will configure an OpenVPN server with 3 Clients:
Normally, OpenVPN Client access is controlled by enabling or disabling the Client to Client button in OpenVPN Servers configuration, however, at times, more granular control is required. In this example, we will configure an OpenVPN server with 3 Clients:
</ul>
</ul>
If You have trouble seeing any of the settings, be sure to enable "'''Advanced mode'''"
[[File:Networking rutos manual webui basic advanced mode 75.gif|none|border|center|class=tlt-border]]
=Topology=
=Topology=
[[File:OpenVPN Topology v1.png|border|center|class=tlt-border]]
[[File:OpenVPN Topology v4.png|none|border|left|class=tlt-border|1000x1000px]]
<li> Client 3 VPN tunnel address - 10.0.0.14, LAN device address - 192.168.30.178</li>
<li> Client 3 VPN tunnel address - 10.0.0.14, LAN device address - 192.168.30.178</li>
</ul>
</ul>
=Generating certificates for an OpenVPN server=
Navigate to '''System → Administration → Certificates → Generate Certificate'''
Navigate to '''System -> Administration -> Certificates'''
Generate 2 certificates. Recommended key size is at least '''2048 bits''' for security reasons:
  1. Generate 2 certificates . Recommended key size is at least '''2048 bits''' for security reasons:
 1. CA
   1.1. CA
 2. Server
In Certificate Manager download Server certificate.
[[File:Certificate download v4.png|none|border|left|class=tlt-border|1100x1100px]]
For any OpenVPN clients, You will need to generate “'''Client'''” certificates, download the certificate and key, and send them to the client
There are multiple methods of how certificates could be generated, you could follow this tutorial instead:
There are multiple methods of how certificates could be generated, you could follow this tutorial instead:
[[How to generate TLS certificates (Windows)?]]
[[How to generate TLS certificates (Windows)?]]
=Creating an OpenVPN server=
=Creating an OpenVPN server=
Navigate to '''Services -> VPN -> OpenVPN'''. Add a new OpenVPN instance with a '''Server role''' with these settings:
Navigate to '''Services -> VPN -> OpenVPN'''
[[File:OpenVPN server settings v3.png|none|border|left|class=tlt-border]]
1 - <b>Client to client</b> – disabled
2 - <b>Virtual network IP address</b> – 10.0.0.0
3 - <b>Virtual network netmask</b> – 255.255.255.224
4 - <b>Certificate files from device</b> - on
Press '''"Save & Apply"''', enable OpenVPN server and check if the server is online.
[[File:OpenVPN server is online v3.png|none|border|left|class=tlt-border|1100x1100px]]
=Connecting clients to the OpenVPN server=
=Connecting clients to the OpenVPN server=
Navigate to '''Services -> VPN -> OpenVPN'''. Add a new OpenVPN instance with a '''Client role''' with these settings:
[[File:OpenVPN Client1 v3.png|none|border|center|class=tlt-border]]
[[File:OpenVPN Client1 v3.png|none|border|center|class=tlt-border]]
   1 - '''Remote host/IP address''' - Public IP of the OpenVPN server's router
   1) Remote host/IP address - Public IP of the OpenVPN server's router
   2 - '''Remote network IP address''' - 10.0.0.0
   2) Remote network IP address - 10.0.0.0
   3 - '''Remote network netmask''' - 255.255.255.224
   3) Remote network netmask - 255.255.255.224
   4 - '''Add the certificates from the OpenVPN server''' - Certificate Authority, Client certificate, and Client key which we downloaded in the Certificate Generation step.
Press "'''Save & Apply'''", enable OpenVPN client, and check if the connection is made
[[File:OpenVPN Client1 connected v2.png|none|border|left|class=tlt-border|1100x1100px]]
Repeat this step for as many clients as You need. For this example, we will have 3 clients.
=Client to Client LAN network communication=
==TLS Clients==
On the OpenVPN server router, navigate to '''Services -> VPN -> OpenVPN''', Press "'''Edit'''" on the server, scroll down and add '''TLS clients''' which LAN address You want to have access to, in our case, we add all 3 clients:
===TLS Client 1===
=Client to Client LAN network communication=
----
[[File:TLS Client1 v3.png|none|border|left|class=tlt-border]]
===TLS Client 2===
----
----
==TLS Clients==
[[File:TLS Client2 v3.png|none|border|left|class=tlt-border]]
===TLS Client 3===
----
----
[[File:TLS Client3 v3.png|none|border|left|class=tlt-border]]
<ul>
<li>'''Common name''' - common name of the certificate which was generated previously</li>
<li>'''Virtual local endpoint''' - client’s local address in the virtual network</li>
<li>'''Virtual remote endpoint''' - client’s remote address in the virtual network</li>
<li>'''Private network''' - client's LAN subnet</li>
<li>'''Covered network''' - Which LAN subnet should clients be able to communicate with in the OpenVPN server</li>
</ul>
==Firewall Zones==
This step should be done on OpenVPN '''server and all clients''' that want their LAN subnets be accessible and to access other client's LAN subnets.
Navigate to '''Network -> Firewall -> General settings -> Zones''' and set OpenVPN zone to forward traffic to LAN.
[[File:TLS Client 1 v2.png|none|thumb|alt=|1000x1000px]]
[[File:OpenVPN to LAN zone forward v2.png|none|border|left|class=tlt-border|1100x1100px]]
==Routes to LAN subnets==
Create a route to other client LAN networks using WebUI. This step should be done on '''all clients''' that want their LAN subnets be accessible and to access other client's LAN subnets.
Navigate to '''Services -> VPN -> OpenVPN''' press '''"Edit"''' on the OpenVPN client and add routes to other client LAN subnets. In this image, we are editing Client 1's configuration's extra options, to add routes to <b>Client 2's (192.168.20.0/24)</b> and <b>Client 3's (192.168.30.0/24)</b> LAN subnets.
(In some cases, pushing routes to LAN addresses from the OpenVPN server to clients, breaks routing on the clients, so doing it from the client side is safer, but more time consuming)
[[File:OpenVPN client routes v2.png|none|border|left|class=tlt-border]]
=Controlling access with firewall=
Navigate to '''Network -> Firewall -> Access Control''' and create a new deny rule. In this example, we are denying Client 3 from accessing any other clients and their LAN networks.
[[File:Deny Client3 rule v2.png|none|border|left|class=tlt-border]]
   1 - '''Protocol''' - All protocols
   2 - '''Source zone''' - OpenVPN
  1. Navigate to '''Services -> VPN -> OpenVPN''' press '''"Edit"''' on the OpenVPN client and add routes to other client LAN subnets. In this image, we are editing Client 1's configuration, to add routes to <b>Client 2's (192.168.20.0/24)</b> and <b>Client 3's (192.168.30.0/24)</b> LAN subnets.
   3 - '''Source IP''' - OpenVPN remote IP and LAN subnet of client 3
   4 - '''Destination zone''' - OpenVPN
   5 - '''Destination address''' - other client OpenVPN remote endpoints and LAN subnets
   6 - '''Action''' - Deny
This rule will deny all traffic from Client 3 to other clients, but will not interact with traffic, if it's destination is OpenVPN server or it's LAN subnet.
=Testing the setup=
This rule will deny all traffic from Client 3 to other clients, but will not interact with traffic, if it's destination is OpenVPN server or it's LAN subnet
If You have followed the steps correctly, configuration should be finished. These should be the results that You will be getting:
Client 1 to Client 2
Client 1 to Client 2
=See also=
=See also=
<ul>
<ul>
=External links=
=External links=
https://openvpn.net/index.php/open-source/documentation/howto.html - some additional information on OpenVPN
https://openvpn.net/index.php/open-source/documentation/howto.html - some additional information on OpenVPN
