I've been noticing for a while now that there has been this message popping up in the logs of one of my routers, exactly once a minute stating the error:
%IGMP-4-NO_INPUT: VRF xx: IGMP packet without input interface received from 126.96.36.199 for 188.8.131.52 -Process= "IGMP Input"
where the recieved address is the tunnel address of the dmvpn tunnel that we use to connect to remote sites.
Multicast is not one of my strong suits and I haven't been able to find much material online relating to this specific area, anyone have any ideas what kinds of things could produce an error like this consistently?
The 184.108.40.206 IP is the all-hosts group multicast. So something is trying to start a multicast message. A few questions:
Do you have a VRF and if so is the interface coming in on a VRF or global table?
Is that IP a public IP for your DMVPN crypto portion - or is it a Private IP coming through the tunnel for LAN traffic?
If it is LAN related is it an IP you can track down?
Your right that there isn't much information out there on that specific error code (that is helpful anyways). I would suggest looking at the other information in the logs to help direct you to another troubleshooting step.
do you have "ip multicast routing" enabled?
are you using "ip pim sparse-dense mode"
what does "show ip igmp snooping" give you?
show ip mroute summary
Debugs you could try - just not all at once :D
debug ip mroute
debug ip igmp
debug ip pim
debug ip mpacket
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