[ovs-discuss] Packets send to tunnel is dropped

Aswin S aswinsuryan at gmail.com
Tue Oct 3 13:46:54 UTC 2017


Hi,

I am observing an issue when a packet that reached the switch through a
tunnel is send back to the same tunnel

The packet reaches the swtich for DNAT through a tunnel. The switch sends
the packet to the same tunnel after doing the reverse NAT(using
ovs-netfilter  integration) with a different tunnel id. But the packet
seems to be dropped by the Ovs though it is hitting the openflow rule to
output the packet to tunnel. I am seeing the below entry in dpctl show when
this traffic is live.

recirc_id(0x43),tunnel(tun_id=0x186a4,src=192.168.0.115,dst=192.168.0.110,flags(-df-csum+key)),in_port(3),ct_state(-snat+dnat),eth(dst=fa:16:3e:fe:6c:89),eth_type(0x0800),ipv4(dst=10.100.5.8,proto=1,frag=no),
packets:3946, bytes:386708, used:0.305s, actions:drop


Is it possible to send packet came from a tunnel back to the same tunnel
but with a different tunnel id or am I missing anything here?

Thanks
Aswin
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