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On 02/10/13 17:33, James Page wrote:
> On 02/10/13 17:24, Gangur, Hrushikesh (R & D HP Cloud) wrote:
>>> http://techbackground.blogspot.co.uk/2013/06/path-mtu-discovery-and-gre.html
>
>>> 
Yeah
>>> 
> - I read that already:
> 
> sudo ip netns exec qrouter-d3baf1b1-55ee-42cb-a3f6-9629288e3221 
> traceroute -n 10.5.0.2 -p 44444 --mtu traceroute to 10.5.0.2
> (10.5.0.2), 30 hops max, 65000 byte packets 1  10.5.0.2  0.950 ms
> F=1500  0.598 ms  0.566 ms
> 
> The PMTU from the l3 gateway to the instance looks OK to me.

I spent a bit more time debugging this; performance from within the
router netns on the L3 gateway node looks good in both directions when
accessing via the tenant network (10.5.0.2) over the qr-XXXXX
interface, but when accessing through the external network from within
the netns I see the same performance choke upstream into the tenant
network.

Which would indicate that my problem lies somewhere around the
qg-XXXXX interface in the router netns - just trying to figure out
exactly what - maybe iptables is doing something wonky?

- -- 
James Page
Ubuntu and Debian Developer
james.page at ubuntu.com
jamespage at debian.org
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