Thanks Brian for the reply. I recently moved from nova-network to neutron and i am still struggling to understand neutron. As per my limited understanding subnets can be duplicated and vlan tag will prevent duplicate ips from communicating.In my setup i can see tap interface connected with a tag of 1144 to br-int and GRE tunnels are used for carrying traffic to compute nodes.In that case could you please tell me what duplicate ips are you mentioning here.I thought it must be a bug in neutron that is allowing duplicate ipv6 to communicate.But with vlan tag even ipv6 should not communicate directly. Confused O_0
On Wed, Nov 18, 2015 at 8:28 PM, Brian Haley <brian.ha...@hpe.com> wrote: > On 11/18/2015 07:33 AM, kevin parrikar wrote: > >> i am trying Juno *without *DVR and there are around 500 sub nets in each >> network >> >> node. >> >> Network nodes have 500+ dnsmasq process which are configured to give >> ipv6,ipv4 >> addresses out of this some fluctuates between D and S state while others >> are in >> continuous S state.Probably because of too many processes in D state with >> "rtnetlink_rcv" in "wchan" its showing very high load average. >> >> >> functions in stack when in D state: >> >> [<ffffffff816360a9>] rtnetlink_rcv+0x19/0x30 >> [<ffffffff81653e25>] netlink_unicast+0xd5/0x1b0 >> [<ffffffff8165420e>] netlink_sendmsg+0x30e/0x680 >> [<ffffffff8160e32b>] sock_sendmsg+0x8b/0xc0 >> [<ffffffff8160e871>] SYSC_sendto+0x121/0x1c0 >> [<ffffffff8160f25e>] SyS_sendto+0xe/0x10 >> [<ffffffff817342dd>] system_call_fastpath+0x1a/0x1f >> [<ffffffffffffffff>] 0xffffffffffffffff >> >> but in couple of seconds it changes to S state with this in stack,all idle >> process have this in stack. >> >> [<ffffffff811d20d9>] poll_schedule_timeout+0x49/0x70 >> [<ffffffff811d2ac6>] do_select+0x5b6/0x780 >> [<ffffffff811d2e5c>] core_sys_select+0x1cc/0x2e0 >> [<ffffffff811d301b>] SyS_select+0xab/0x100 >> [<ffffffff817342dd>] system_call_fastpath+0x1a/0x1f >> [<ffffffffffffffff>] 0xffffffffffffffff >> >> interface in which dnsmasq is listening has " tentative dadfailed" in >> "scope >> global" for ipv6 for all the dnsmasq process that are in D state. >> >> i don't understand why duplicate ipv6 issue is coming when there are vlan >> tags >> to separate each sub net.For ipv4 duplicate IP issue is not coming for >> same subnet. >> > > DAD failure is fatal for the address, as it won't be tried again without > bouncing the interface or tweaking the disable_ipv6 sysctl on the > interface. The "tentative" flag is just showing it is still in that state > (i.e. waiting for DAD to complete). Figuring out why this is happening > will most likely solve your problem, but there isn't enough here to go on. > > The fact that you don't see an IPv4 'duplicate' message is that it's not > going to typically do it, so you could have a duplicate there and just not > know it. > > I'd say to try Kilo or Liberty, but it's unclear if this is a Neutron > issue or something more basic with your setup. > > -Brian > > > Not able to understand why dnsmasq that are connected to interfaces that >> have >> "tentative dadfailed " continuously changes between S and D state while >> others >> are idle. >> >> attached is the strace while dnsmasq is in D state. >> >> Any idea about this issue? >> >> >> _______________________________________________ >> Mailing list: >> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack >> Post to : openstack@lists.openstack.org >> Unsubscribe : >> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack >> >> > > _______________________________________________ > Mailing list: > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack > Post to : openstack@lists.openstack.org > Unsubscribe : > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack >
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