Strange GRE reverce path check error

Unanswered Question
Feb 2nd, 2009


On one of my inside interface I constantly get this error:

Deny GRE reverse path check from to 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.


I have this problem too.
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passioncas Mon, 02/02/2009 - 04:53


Please let me know the GRE interface IP address.Assume that the GRE Tunnel has been configured over internet.Then it can be an IP address configured on the GRE interface

Please let me know

passioncas Mon, 02/02/2009 - 05:17


Hope you are getting this error on the Switch.request you to share the configuration of the Switch


Bernard Magny Mon, 02/02/2009 - 06:39

I understand this, but it's on the inside of my network. So I would like to find a way to find what host is doing this.



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