That's a great guess :D I did manage to figure this out earlier and it took me a day of understanding OVS and following datapath/flow dumps until I realized that the non-standard configuration I had was causing the creation of a GRE tunnel from the machine to itself (on another IP).
Thanks! On Mon, Aug 26, 2013 at 5:24 PM, Darragh O'Reilly <[email protected]> wrote: > > > 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 >> >> >> -- 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
