Docker udp traffic

docker0

tcpdump -i docker0

21:37:59.981107 IP ip-172-17-0-61.ec2.internal.43650 > ip-10-0-0-208.ec2.internal.distinct: UDP, length 39
21:37:59.981254 IP ip-172-17-42-1.ec2.internal.43069 > ip-172-17-0-59.ec2.internal.distinct: UDP, length 39
21:38:00.005553 IP ip-172-17-0-59.ec2.internal.58820 > ip-172-17-42-1.ec2.internal.43069: UDP, length 5

Client at ip-172-17-0-61 sent a request to ip-10-0-0-208  (eth0 address of docker host)
Host (docker0) at ip-172-17-42-1 forwarded packet to ip-172-17-0-59  (Server)
Server at ip-172-17-0-59 replied to ip-172-17-42-1.ec2 host (docker0)

This last packet should have continued on the Client at ip-172-17-0-61

tcpdump

Server 1:

Client in container

22:15:15.232501 IP 4a1ab882592b.54207 > server_ip.distinct: UDP, length 39
22:15:17.241173 IP 4a1ab882592b.48634 > server_ip.distinct: UDP, length 39
22:15:18.245134 IP 4a1ab882592b.54178 > server_ip.distinct: UDP, length 39


Client host

21:15:19.249198 IP client_ip.36485 > server_ip.distinct: UDP, length 39
21:15:19.270214 IP server_ip.44997 > client_ip.36485: UDP, length 5
21:15:21.257885 IP client_ip.54031 > server_ip.distinct: UDP, length 39
21:15:21.279453 IP server_ip.36413 > client_ip.54031: UDP, length 5
21:15:22.261956 IP client_ip.41380 > server_ip.distinct: UDP, length 39
21:15:22.283351 IP server_ip.57030 > client_ip.41380: UDP, length 5
21:15:23.265899 IP client_ip.58178 > server_ip.distinct: UDP, length 39
21:15:23.288483 IP server_ip.36819 > client_ip.58178: UDP, length 5
21:15:25.274450 IP client_ip.47060 > server_ip.distinct: UDP, length 39


Docker host 2:

Server log in container
2014-08-14 22:16:21,526 | INFO | server_threaded.py:50 | request from client_ip:43166 (39 bytes in, 5 bytes out, error=0)