> however I can't tcpdump on the patch or gre devices.... > > # tcpdump -i patch-tun > tcpdump: patch-tun: No such device exists >
I can reproduce this. I suspect because patch-tun and patch-int are OVS patch interfaces, they are internal to OVS and not a real interface. "ip a | grep patch-tun" returns no results, so that supports that theory. > is there a way to do this? Right now I can only see what's happening > at the beginning (tap) and end (ethN) > tcpdump on br-tun shows no traffic for me. If I run tcpdump on the interface that hosts the IP of the tunnel endpoint, then I do see GRE packets: tcpdump -i eth0 proto gre But you're not seeing any traffic there, so the packet isn't making it that far... How about "brctl show"? There should be a bridge called qbrXXX that bridges the tap interface to a qvb interface. The qvb interface is a veth pair to a qvo interface on OVS. If you can't see packets between qbr, qvb, or qvo, then I'd imagine the problem is somewhere with the linux standard bridging. Joe
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