[ovs-discuss] Subsequent packets get lost

[gowrishankar]

On Monday 27 April 2015 04:03 PM, Peter Bryzgalov wrote:
> Hi,
>
> I have connected two Docker containers on two hosts through an OVS 
> tunnel (tested GRE and VXLAN). I can ping and even login with ssh from 
> one container to another through the tunnel, but I cannot use scp, 
> iperf, etc., because for streams only the first packet reaches 
> destination and all subsequent packets get lost.
>

Make sure you have configured right MTU (1462) for docker bridge and 
container interfaces.

Hope this one http://wiredcraft.com/blog/multi-host-docker-network/ 
helps you.

Thx,
Gowrishankar

> For both servers:
>
> OS: Ubuntu 12.04
> Kernel: 3.13.0-49-generic
>
> OVS version:
> ovs-vsctl (Open vSwitch) 2.3.1
> Compiled Apr 24 2015 19:17:31
> DB Schema 7.6.2
>
> ovs-vsctl show (on 172.19.5.5 server):
>     Bridge ovs-bridge
>         Port "tap10654"
>             Interface "tap10654"
>                 type: internal
>         Port ovs_gre
>             Interface ovs_gre
>                 type: gre
>                 options: {remote_ip="172.19.5.12"}
>         Port ovs-bridge
>             Interface ovs-bridge
>                 type: internal
>
> Tap interface is moved inside a Docker container namespace and 
> assigned an IP address (10.0.0.5 on one server and 10.0.0.6 on another).
>
> I did tcpdump for perf session (fragment):
> this packet passed:
> 16:29:49.454168 IP 172.19.5.5 > 172.19.5.12: GREv0, length 94: IP 
> 10.0.0.5.39330 > 10.0.0.6.5001: Flags [P.], seq 1:25, ack 1, win 229, 
> options [nop,nop,TS val 62341003 ecr 212259725], length 24
> these packets lost:
> 16:29:49.454238 IP 172.19.5.5 > 172.19.5.12: GREv0, length 1518: IP 
> 10.0.0.5.39330 > 10.0.0.6.5001: Flags [.], seq 25:1473, ack 1, win 
> 229, options [nop,nop,TS val 62341003 ecr 212259725], length 1448
> 16:29:49.454246 IP 172.19.5.5 > 172.19.5.12: GREv0, length 1518: IP 
> 10.0.0.5.39330 > 10.0.0.6.5001: Flags [.], seq 1473:2921, ack 1, win 
> 229, options [nop,nop,TS val 62341003 ecr 212259725], length 1448
> 16:29:49.454248 IP 172.19.5.5 > 172.19.5.12: GREv0, length 1518: IP 
> 10.0.0.5.39330 > 10.0.0.6.5001: Flags [.], seq 2921:4369, ack 1, win 
> 229, options [nop,nop,TS val 62341003 ecr 212259725], length 1448
> 16:29:49.454250 IP 172.19.5.5 > 172.19.5.12: GREv0, length 1518: IP 
> 10.0.0.5.39330 > 10.0.0.6.5001: Flags [.], seq 4369:5817, ack 1, win 
> 229, options [nop,nop,TS val 62341003 ecr 212259725], length 1448
> 16:29:49.454253 IP 172.19.5.5 > 172.19.5.12: GREv0, length 1518: IP 
> 10.0.0.5.39330 > 10.0.0.6.5001: Flags [.], seq 5817:7265, ack 1, win 
> 229, options [nop,nop,TS val 62341003 ecr 212259725], length 1448
> 16:29:49.454255 IP 172.19.5.5 > 172.19.5.12: GREv0, length 1518: IP 
> 10.0.0.5.39330 > 10.0.0.6.5001: Flags [.], seq 7265:8713, ack 1, win 
> 229, options [nop,nop,TS val 62341003 ecr 212259725], length 1448
> 16:29:49.454257 IP 172.19.5.5 > 172.19.5.12: GREv0, length 1518: IP 
> 10.0.0.5.39330 > 10.0.0.6.5001: Flags [.], seq 8713:10161, ack 1, win 
> 229, options [nop,nop,TS val 62341003 ecr 212259725], length 1448
> 16:29:49.454259 IP 172.19.5.5 > 172.19.5.12: GREv0, length 1518: IP 
> 10.0.0.5.39330 > 10.0.0.6.5001: Flags [.], seq 10161:11609, ack 1, win 
> 229, options [nop,nop,TS val 62341003 ecr 212259725], length 1448
> 16:29:49.454264 IP 172.19.5.5 > 172.19.5.12: GREv0, length 1518: IP 
> 10.0.0.5.39330 > 10.0.0.6.5001: Flags [.], seq 11609:13057, ack 1, win 
> 229, options [nop,nop,TS val 62341003 ecr 212259725], length 1448
>
>
> Regards,
> Peter
>
>
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-- 
Regards,
Gowrishankar M
Linux Networking

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