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L2TP configuration examples RutOS (view source)
Revision as of 12:15, 25 May 2022
, 12:15, 25 May 2022Created page with "==Introduction== '''Layer 2 Tunneling Protocol''' ('''L2TP''') is a tunneling protocol used to support virtual private networks (VPNs) or as part of the delivery of services..."
==Introduction==
'''Layer 2 Tunneling Protocol''' ('''L2TP''') is a tunneling protocol used to support virtual private networks (VPNs) or as part of the delivery of services by ISPs. It does not provide any encryption or confidentiality by itself. Rather, it relies on an encryption protocol that it passes within the tunnel to provide privacy.
This article provides an extensive configuration example with details on how to create a connection between an L2TP Server and Client, both of which configured on RUTxxx routers. If you wish to learn how to encrypt the traffic of your L2TP tunnel, we suggest you take a look at our '''[[L2TP over IPsec]]''' article.
==Configuration overview and prerequisites==
Before we begin, let's overview the configuration that we are attempting to achieve and the prerequisites that make it possible.
'''Prerequisites''':
*Two RUTxxx routers of any type (excluding [[RUT850]])
*A SIM card with a Public Static or Public Dynamic IP address for the L2TP Server
*An end device (PC, Laptop, Tablet, Smartphone) to configure the routers
----
'''Configuration scheme''':
[[File:Configuration examples l2tp scheme.png]]
As indicated by the figure above, the configuration we are trying to achieve here is very basic: it concerns two RUTxxx routers - RUT1 and RUT2. One functions as an L2TP Server, the other - an L2TP Client. They are connected into a virtual network via an L2TP Tunnel.
==Router configuration==
If you have familiarized yourself with the configuration scheme and have all of the devices in order, we can start configuring the routers using instructions provided in this section.
===L2TP Server (RUT1)===
----
As mentioned in the prerequisites section, the router that acts as the '''server''' must have a Public Static or Public Dynamic IP address (more information on the subject can be found '''[[Private and Public IP Addresses|here]]'''). If that is in order, we should start configuring the server.
----
*Login to the router's WebUI and go to '''Services → VPN → L2TP'''. Select '''Role: Server''', enter a name for the new instance and click the "Add" button:
[[File:Creating an l2tp server part 1 v1.png]]
----
*Click the "Edit" button located to the right of the newly created L2TP Server to enter the instance's settings window. The configuration is fairly simple, just remember to '''Enable''' the instance:
[[File:Creating an l2tp server part 2 v1.png]]
----
*The rest of the parameters are user preferential so you should set them as you see fit. A short explanation on these parameters is provided below:
**'''Local IP''' defines the server's virtual IP address
**'''Remote IP range''' parameters define the range of virtual IP addresses that will be assigned to connecting clients
**'''User name''' and '''Password''' parameters define a client's authentication info
Once you're done setting these parameters don't forget to click the '''Save''' button.
===L2TP Client (RUT2)===
----
*Now let's configure the L2TP '''Client'''. Login to the router's WebUI and go to '''Services → VPN → L2TP'''. Select '''Role: Client''', enter a name for the new instance and click the "Add" button:
[[File:Creating an l2tp client part 1 v1.png]]
----
*Click the "Edit" button located to the right of the newly created L2TP Client to enter the instance's settings window. In the settings window, '''Enable''' the L2TP instance, specify the server's '''Public (WAN) IP address''' and the '''client's authentication''' info as specified in the server's configuration:
[[File:Creating an l2tp client part 2 v1.png]]
Once this is done, don't forget to save the changes.
----
*'''Optional''': if you plan on using the server as a web proxy, you should also enable the '''Default route''' option in the client's configuration:
[[File:How set up l2tp proxy part 3 v1.png]]
==Testing the setup==
If you've followed all the steps presented above, your configuration should be finished. But as with any other configuration, it is always wise to test the setup in order to make sure that it works properly. In order to test an L2TP connection, login to one of the routers' WebUIs and go to '''Services → CLI'''. Login with user name: '''root''' and the router's admin password. You should then be able to '''ping''' the opposite instance, i.e., if you logged in to the server's CLI, you should be able to ping the client's virtual IP address, and vice versa. To use a ping command, type '''ping <ip_address>''' and press the "Enter" key on your keyboard:
[[File:Configuration example l2tp pptp testing.png]]
If the ping requests are successful, congratulations, your setup works! If not, we suggest that you review all steps once more.
If you're using the server as a web proxy, end devices connected to the L2TP client router should have the Public IP address of the L2TP server. You can visit this website to check the Public IP address: http://www.whatsmyip.org/
==See also==
*[[L2TP over IPsec]]
*Other types of VPNs suported by RUTxxx devices:
**[[OpenVPN configuration examples]]
**[[IPsec configuration examples]]
**[[GRE Tunnel configuration examples]]
**[[PPTP configuration examples]]
'''Layer 2 Tunneling Protocol''' ('''L2TP''') is a tunneling protocol used to support virtual private networks (VPNs) or as part of the delivery of services by ISPs. It does not provide any encryption or confidentiality by itself. Rather, it relies on an encryption protocol that it passes within the tunnel to provide privacy.
This article provides an extensive configuration example with details on how to create a connection between an L2TP Server and Client, both of which configured on RUTxxx routers. If you wish to learn how to encrypt the traffic of your L2TP tunnel, we suggest you take a look at our '''[[L2TP over IPsec]]''' article.
==Configuration overview and prerequisites==
Before we begin, let's overview the configuration that we are attempting to achieve and the prerequisites that make it possible.
'''Prerequisites''':
*Two RUTxxx routers of any type (excluding [[RUT850]])
*A SIM card with a Public Static or Public Dynamic IP address for the L2TP Server
*An end device (PC, Laptop, Tablet, Smartphone) to configure the routers
----
'''Configuration scheme''':
[[File:Configuration examples l2tp scheme.png]]
As indicated by the figure above, the configuration we are trying to achieve here is very basic: it concerns two RUTxxx routers - RUT1 and RUT2. One functions as an L2TP Server, the other - an L2TP Client. They are connected into a virtual network via an L2TP Tunnel.
==Router configuration==
If you have familiarized yourself with the configuration scheme and have all of the devices in order, we can start configuring the routers using instructions provided in this section.
===L2TP Server (RUT1)===
----
As mentioned in the prerequisites section, the router that acts as the '''server''' must have a Public Static or Public Dynamic IP address (more information on the subject can be found '''[[Private and Public IP Addresses|here]]'''). If that is in order, we should start configuring the server.
----
*Login to the router's WebUI and go to '''Services → VPN → L2TP'''. Select '''Role: Server''', enter a name for the new instance and click the "Add" button:
[[File:Creating an l2tp server part 1 v1.png]]
----
*Click the "Edit" button located to the right of the newly created L2TP Server to enter the instance's settings window. The configuration is fairly simple, just remember to '''Enable''' the instance:
[[File:Creating an l2tp server part 2 v1.png]]
----
*The rest of the parameters are user preferential so you should set them as you see fit. A short explanation on these parameters is provided below:
**'''Local IP''' defines the server's virtual IP address
**'''Remote IP range''' parameters define the range of virtual IP addresses that will be assigned to connecting clients
**'''User name''' and '''Password''' parameters define a client's authentication info
Once you're done setting these parameters don't forget to click the '''Save''' button.
===L2TP Client (RUT2)===
----
*Now let's configure the L2TP '''Client'''. Login to the router's WebUI and go to '''Services → VPN → L2TP'''. Select '''Role: Client''', enter a name for the new instance and click the "Add" button:
[[File:Creating an l2tp client part 1 v1.png]]
----
*Click the "Edit" button located to the right of the newly created L2TP Client to enter the instance's settings window. In the settings window, '''Enable''' the L2TP instance, specify the server's '''Public (WAN) IP address''' and the '''client's authentication''' info as specified in the server's configuration:
[[File:Creating an l2tp client part 2 v1.png]]
Once this is done, don't forget to save the changes.
----
*'''Optional''': if you plan on using the server as a web proxy, you should also enable the '''Default route''' option in the client's configuration:
[[File:How set up l2tp proxy part 3 v1.png]]
==Testing the setup==
If you've followed all the steps presented above, your configuration should be finished. But as with any other configuration, it is always wise to test the setup in order to make sure that it works properly. In order to test an L2TP connection, login to one of the routers' WebUIs and go to '''Services → CLI'''. Login with user name: '''root''' and the router's admin password. You should then be able to '''ping''' the opposite instance, i.e., if you logged in to the server's CLI, you should be able to ping the client's virtual IP address, and vice versa. To use a ping command, type '''ping <ip_address>''' and press the "Enter" key on your keyboard:
[[File:Configuration example l2tp pptp testing.png]]
If the ping requests are successful, congratulations, your setup works! If not, we suggest that you review all steps once more.
If you're using the server as a web proxy, end devices connected to the L2TP client router should have the Public IP address of the L2TP server. You can visit this website to check the Public IP address: http://www.whatsmyip.org/
==See also==
*[[L2TP over IPsec]]
*Other types of VPNs suported by RUTxxx devices:
**[[OpenVPN configuration examples]]
**[[IPsec configuration examples]]
**[[GRE Tunnel configuration examples]]
**[[PPTP configuration examples]]
