badly configured tunnels can cause the symptoms you see. So you could focus on that if your quantum network is using gre tunnels.
Run 'ovs-vsctl show' on each node and check the remote_ip of each port on br-tun. >________________________________ > From: Mina Nagy Zaki <[email protected]> >To: openstack <[email protected]> >Sent: Saturday, 24 August 2013, 11:38 >Subject: [Openstack] Intermittent connectivity problems from qrouter >namespace > > >I'm using nova 2013.1.2 with quantum/neutron. > >I have a router with a fixed net and an external gateway. There's >unexplained packet loss from the router's network namespace to the >VM's fixed IPs. I've seen it with ARP requests, ping requests, and >pretty much everything else. Sometimes they just don't go through for >a while. I've also seen a pattern of 2s, 1s, 0.5s ping times on the >first 3 packets, then normal ping times of <1ms. >VM -> external network traffic is working great though. > >I've tried monitoring the OVS flows and they don't seem to change. >I've been tcpdumping the interfaces, and packets simply fail to make >it over the qbrXXXXX bridge sometimes. > >Also, after a 'warm up' period of trying to ping the machines and >failing, once a few packets make it through it starts working >semi-reliably. > >I'm lost. Where do I start with this???? > >-- >Mina Nagy Zaki > >_______________________________________________ >Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack >Post to : [email protected] >Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack > > > _______________________________________________ Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack Post to : [email protected] Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
