How to allow l2tp connections from specific mikrotik addresses?

Question

Mikrotik

There are 3 branches. as a gateway everywhere Mikrotik - I connect three branches via l2tp,
I want to allow connection only from the IP addresses of these branches, but I can’t figure out how.
I tried to enable logging in the firewall on the l2tp server (for a test) with incoming traffic on port 1701 - this did not work. Only the external address of the l2tp server itself gets there.

Answer 1

Add the Src setting to the allow rule for port 1701. Address List (specify the name of the sheet) Next, create sheets with addresses of client routers.