there is something strange happening on our Routers (CCR). Several times per day, the router logs a "Invalid sequence number / MD5 authentication failed" message. (see attached Picture)
It looks like the router receives an OSPF packet that is too "old" and the problem gets worse if I lower the hello times. So I first thought, there must be packet loss or something, but if I disable MD5, everything works like a charm.
The funny thing is that this happens only between Mikrotik routers. Sessions between Cisco and Mikrotik work as expected.
Any Ideas from you guys?