Friday, 2019-04-19

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openstackgerritDongcan Ye proposed openstack/neutron-vpnaas master: Fix vpn agent delete router error  https://review.openstack.org/65389802:29
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openstackgerritGuo Jingyu proposed openstack/neutron master: Fix bug: AttributeError arises while sorting with standard attributes  https://review.openstack.org/65390303:35
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openstackgerritReedip proposed openstack/networking-ovn master: Add Unit testing for Octavia OVN Driver  https://review.openstack.org/60194804:36
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openstackgerritReedip proposed openstack/networking-ovn master: Modify Member operations and Pool status changes  https://review.openstack.org/63658906:02
openstackgerritReedip proposed openstack/networking-ovn master: Add Unit testing for Octavia OVN Driver  https://review.openstack.org/60194806:02
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openstackgerritRodolfo Alonso Hernandez proposed openstack/neutron master: Change provider network segmentation ID in OVS agent  https://review.openstack.org/63298406:48
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openstackgerritReedip proposed openstack/networking-ovn master: Update Octavia OVN Driver to handle corner cases  https://review.openstack.org/65159007:07
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openstackgerritBernard Cafarelli proposed openstack/networking-sfc master: Complete move of networking-sfc tempest tests to tempest plugin  https://review.openstack.org/65374713:09
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openstackgerritOleg Bondarev proposed openstack/neutron master: Move subnet postcommit out of transaction for bulk create  https://review.openstack.org/65394713:49
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nwilburnHey quick question. I am seeing errors on my openvswitch interface when running this command: sudo ovs-ofctl dump-ports br-int | grep 75. I am trying to track down where/why/when packets are being dropped when the size of an incoming packet is larger than 1496. I would expect to see the number of "drops" increasing, but instead of I see the number of "errs" increasing14:19
nwilburnI am also seeing the following in dmesg: "qg-5f7fa1ad-eb: dropped over-mtu packet: 1497 > 1496".14:20
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openstackgerritHarald Jensås proposed openstack/neutron master: Conntrack Helper -  OVO and db script  https://review.openstack.org/65026914:20
openstackgerritHarald Jensås proposed openstack/neutron master: Conntrack Helper - Plugin  https://review.openstack.org/65027014:20
openstackgerritHarald Jensås proposed openstack/neutron master: Agent - Conntrack Helper  https://review.openstack.org/65084614:21
davidshanwilburn: Check the MTU on the OVS bridge through ovs and ip link seperately, it sound like one might be set to 1400 and the other to 150014:23
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nwilburnHow can I check the MTU of the bridge through ovs?14:26
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nwilburnSo the interface "qg-5f7fa1ad-eb" is set to 1496 as seen with ip link show inside the correct network namespace. "sudo ovs-vsctl get interface qg-5f7fa1ad-eb mtu" returns "[]". The external bridge, which has a patch port into the internal bridge, is indeed set at 1500 MTU.14:35
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davidshanwilburn: Sorry thought you could see the MTU on the bridge, you can increase the MTU of br-ex through ip link to 1500, hopefully that will fix the issue14:39
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nwilburnbr-ex is 1500 already.14:40
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davidshanwilburn:  kk, then try dropping the patch port to br-ex to 140014:41
nwilburnIs ovs supposed to be fragmenting the packets instead of "dropping" them? I'm confused as to why the error count is increasing on the ovs port instead of the drop count14:42
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davidshanwilburn: I think it can depend on how the bridge is configured, I'm a bit rusty on my ovs though.14:44
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nwilburnSo inside the network namespace of the qrouter I can see the incoming icmp request with TCPdump when listening on the external interface (qg-5f7fa1ad-eb). However, when listening on the interface attached to the tenant network I cannot see any ICMP requests going through. So it looks like the packet is indeed being dropped after reaching the router's external interface14:47
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nwilburnWhich means it made it through br-int right? or is that the thing that is dropping it.. hmmm14:47
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davidshanwilburn: you have set up a security rule to let ICMP packets through right?14:48
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nwilburnYup. packets less than 1496 bytes make it through fine14:48
davidshaincluding ICMP?14:49
nwilburnIts definitely and mtu "problem". But I am trying to figure out if its an actual issue or something that is to be expected14:49
nwilburnCorrect, icmp packets make it through14:49
davidshakk14:49
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nwilburnon windows: "ping -l 1468 <host>" works. "ping -l 1469 <host" no work14:49
davidshahmmm14:50
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openstackgerritDeepak proposed openstack/python-neutronclient master: Add support for TaaS in NeutronClient  https://review.openstack.org/44918814:50
nwilburnand it appears its being dropped (or errored?) after reaching br-int and hitting the router's external interface14:50
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davidshanwilburn: I'm going to have to run in a minute, can you ping other instances within br-int with "ping -l 1469 <host>"?14:56
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nwilburnI cannot ping other instances from my box with 1469. However I can ping the instance from inside the network namespace of the qrouter with 146914:58
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davidshanwilburn: Ok, so when ping the instances through the namespace, thats coming from the host correct? It sounds like all of the ports for the instances are set to 1496 as they're MTU, they must have inherited it from a configuration file maybe, check /etc/neutron/plugins/ml2/ml2_conf.ini and see if an MTU is set there.15:04
-openstackstatus- NOTICE: Gerrit is offline for several hours starting at 15:00 UTC to perform the opendev migration; see http://lists.openstack.org/pipermail/openstack-discuss/2019-April/005011.html15:04
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davidshanwilburn: and sorry, but I need to run, hopefully you're not too far off finding the fix, good luck!15:05
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nwilburnno problem davidsha. thanks15:08
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nwilburnFor those listening: tcpdumping on bond0 of the openstack controller shows the large ICMP packet and its fragment coming in. the qrouter interface's tcpdump only shows the fragment. dmesg displays a message saying it dropped the packet, which I assume is the first piece of the fragment15:17
nwilburnthe packet is being chopped up at 1500 bytes it looks like15:17
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nwilburnSo I believe the issue is definitely the fact that the physical nic's MTU and the virtual NIC's MTU are different. This appears to be a default set by triple in neutron.16:38
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mnaserwhile we're twiddling thumbs22:48
mnaseranyone know why https://github.com/openstack/neutron/blob/c21d922abd1208a72fe64d404a8eab93e0c56870/neutron/plugins/ml2/extensions/dns_integration.py#L368-L369 is a thing?22:48
mnaserI mean if we allow floating IPs to have reverse DNS records setup and modified22:49
mnaserwhy don't we do the same to fixed IPs..22:49
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