Cannot ping through L2TP over IPsec tunnel with two RUT955

Hi,
I’m trying to establish a point-to-point transfer tunnel using two RUT955 routers. The L2TP over IPsec tunnel is created successfully, and I can ping from the CLI. However, I’m unable to access or ping from the PC.

Could you please help me identify what I might be missing?

I want to be able to access Device B and Friend’s PC from Home PC, and vice versa.

Thank you

Hello,

This sounds like a potential firewall and/or routing-related issue.

First thing I’d like to check is whether Masquerading is enabled on both of the devices. Please head to Network → Firewall, for newer firmware versions, there’s a separate tab under Network → Firewall → Zones, whereas for older firmware versions, it’s all under Network → Firewall → General settings.

Once you’re in the tab, please ensure that Masquerading is enabled for all the relevant zones. After enabling (if it was disabled), press on Save & Apply to ensure that the configuration is pushed:

You can then try testing whether the pings start going through (usually, they do!)

If that doesn’t help, you can try setting up static routes on both ends (devices) to see if that helps. You head to Network → Routing → Static routes and set up a route on both of the devices similar to this:


The interface should be your L2TP interface (or its name), and the IPv4-Gateway address can either be kept blank or can be the local end of the VPN.

Vice-versa for the other device as well, all that changes is the Target IP address, which, in your case, will be 192.168.11.0.

I would also suggest trying to completely disable Windows firewall (assuming you use Windows) to see if it could be the case that a rule is blocking something somewhere. If so, tweaks will be required from your end.

Let me know how it goes.
M.

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