How does the L2TP server on MikroTik choose the network interface for the transport?

Question

VPN

There is MikroTik CCR1036 with L2TP server.
The router has multiple IP addresses. Let's say A1 and A2.
Clients are connected to it on A1.
For some reason, MikroTik sends response packets from A2.
As a result, clients who sit behind NAT do not receive these packets.
Tell me, how can I force the IP address for the L2TP server on MikroTik?

Answer 1

Try to mark such traffic in the mangle, send it there to a separate routing table. And in this table, in the route 0.0.0.0/0, specify the correct pref-
src there are three rules in the mangle, two for marking packets (incoming outgoing), one for marking the route.