On Mon, Jun 16, 2014 at 9:40 AM, Andreas Hasenack <[email protected]> wrote:
> > > > On Fri, Jun 13, 2014 at 5:01 PM, Andreas Hasenack <[email protected]> > wrote: > >> Hi, >> >> I'm not sure where or how this should be fixed. >> >> I have a case where openstack was juju deployed with neutron networking, >> and we needed to set instance-mtu = 1454 in the neutron-gateway charm. >> >> > For reference: > http://techbackground.blogspot.co.uk/2013/06/path-mtu-discovery-and-gre.html > > The right ICMP packet is generated, but that's it. This is what I see on neutron-gateway: 19:13:05.600151 IP 10.96.1.4 > 10.96.1.4: ICMP 10.96.1.9 unreachable - need to frag (mtu 1500), length 556 These are the actors: 10.96.0.10: MAAS server (10.96.0.0/21) 10.96.1.4: neutron-gateway's br0 (MTU 1500) 10.96.1.9: nova-compute where my instance is running (br0, MTU also 1500) 10.10.0.6 (not shown): my instance, running on 10.96.1.9 (eth0, MTU 1454). wget http://10.96.0.10/ works 10.0.3.251 (not shown): lxc on instance above, MTU 1500, running wget http://10.96.0.10/. It connects (tcp handshake) but gets stuck. I don't see that ICMP packet anywhere else.
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