On one of my inside interface I constantly get this error:
Deny GRE reverse path check from 220.127.116.11 to 18.104.22.168 on interface Operations
I'm having difficulties finding out where it comes from.
we don't have any IPs in that range on the inside of the network. It must be some kind of server with a bad configuration. I can't find the source IP in the ARP table of the switch.
I was wondering if someone can guide me in the right direction to find out what device is doing this.