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Hi Gangur

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.

> On 02/10/13 16:37, Jay Pipes wrote:
>> Hi James, have you tried setting the MTU to a lower number of
>> bytes, instead of a higher-than-1500 setting? Say... 1454 instead
>> of 1546?
> 
>> Curious to see if that resolves the issue. If it does, then
>> perhaps there is a path somewhere that had a <1546 PMTU?
> 
> Do you mean in instances, or on the physical servers?
> 
> For context I hit this problem prior to tweaking MTU's (defaults
> of 1500 everywhere).

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