Hello, i have 4 mikrotik.
2 - > 951G-2HnD
1 - > CCR1009-8G-1S
1 - > 750Gr3
CCR is main, and i connect all other to him with GRE+IPSEC tunnel using /31 mask for p2p.
I write static routes from CCR to other and from other to CCR . And all should be fine i can ping and traceroute locals from CCR to all 951, and back.
and i can ping and traceroute from CCR to 750, BUT cant it back. Only after i change /31 to /30 then i can ping and trace all routes and hosts.
Rechecked few times with full route rebuilds. And result was same.
750gr3 - does not want to work with a mask / 31