Hello

I have a gre over ipsec up & running between 2 mikrotik routers A and B.

The topology is the following:
LanA-> router A <-> router B <-LanB

Ping from a host from Lan A to a host on the network B is ok.
Ping from cmd of router A to the same host on B not working.
Ping from cmd of router A to address of gre on router B is ok.

How can this happen?

Thank you

What happends if you specify source IP ? It works, i suppose.

Just little hint, torch traffic from router A when you are trying to ping host B, and look in source IP field.

I had this problem and found the packet was trying to leave the router over the GRE tunnel with the wrong source address - it was using the address of my main WAN link rather than the tunnel address. I solved this by using a src-nat on the traffic from the router to the tunnel e.g. a.b.c.d/e is your remote network and p.q.r.s is the correct local address to match the IPSec 'interesting' traffic criteria.