Friday, 2020-05-15

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slaweq#startmeeting neutron_drivers14:00
openstackMeeting started Fri May 15 14:00:12 2020 UTC and is due to finish in 60 minutes.  The chair is slaweq. Information about MeetBot at http://wiki.debian.org/MeetBot.14:00
openstackUseful Commands: #action #agreed #help #info #idea #link #topic #startvote.14:00
*** openstack changes topic to " (Meeting topic: neutron_drivers)"14:00
openstackThe meeting name has been set to 'neutron_drivers'14:00
njohnstono/14:00
mlavalleo/14:00
slaweqGood Morning/Afternoon/Evening :)14:00
amotokihi14:00
jamesdentonhi14:00
slaweqwe are waiting for haleyb and yamamoto still14:01
haleybhi14:01
njohnstonhttps://media.giphy.com/media/K8KtAeRA1w44E/source.gif14:01
slaweqnjohnston: LOL14:01
slaweqgood morning is missing there :P14:01
njohnstonhe only gets 80% code coverage for that14:02
slaweq:D14:02
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ralonsohhi14:03
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slaweqok, lets start14:05
slaweqmaybe yamamoto will join us in the meantime14:05
slaweq#topic RFEs14:05
*** openstack changes topic to "RFEs (Meeting topic: neutron_drivers)"14:05
slaweqwe have one rfe for today14:05
slaweqhttps://bugs.launchpad.net/neutron/+bug/187730114:05
openstackLaunchpad bug 1877301 in neutron "[RFE] L3 Router support ndp proxy" [Wishlist,Confirmed]14:05
slaweqhaleyb already triaged it - thx :)14:06
njohnstonyamamoto sent email that he would be unable to make it but he left a question in the LP14:06
slaweqthx njohnston I probably missed this email somehow14:06
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haleybso i'm guessing people are still reading my long notes in the bug? :)14:12
mlavalleI liked Brian's contrast of L3 vs. L2. Thanks, nice way to put it14:12
mlavallehaleyb's explanation is very good14:13
haleybmlavalle: yeah, about half way through i started to remember about router caches and memory consumption14:13
haleybbut IPv6 ND is actually over L3, even if it doesn't look like it14:14
mlavalleso the upstream router thinks it is aneighboring address14:14
haleybright, similar to proxy ARP14:14
haleybthe potential for number of addresses is just much larger with the address space14:15
slaweqhaleyb: and this proxy can be done by kernel on network node, so we don't need any new soft like e.g. radvd for RA14:15
slaweqor is there any additional soft required to do that?14:15
slaweqok, I see something like "ip -6 neigh add proxy 2001:400:1234:567:ffff::8 dev qg-733bd76b-62" in description14:16
mlavalleI think it is all kernel14:16
haleybslaweq: that's a good question.  with proxy ARP there is usually an ARP transmit, I'm not sure there's an equivalent utility for IPv6 ND14:16
slaweqso should be possible without any additional tools14:16
haleybso if an instance is migrated there is still the possibility of lost packets, so it's a good question14:17
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mlavalleand yeah, when triaging this RFE during my bugs deputy week, I read through https://tools.ietf.org/html/rfc4389 as yamamoto suggests14:18
mlavallebut it wasn't as crystal clear as haleyb's explanation14:18
haleybalthough it's Experimental, most vendors have implemented some form of IPv6 proxy ND14:18
haleybmlavalle: I've had IPv6 on the brain since 199514:19
mlavalleit shows ;-)14:19
haleybor was it 1996 i forget :)14:20
mlavallebeyond 20 years, at our age, we probably want to forget... at least I do LOL14:20
haleybhttps://www.ipv4.sixxs.net/archive/docs/ipv6-history/6bone-mailinglist/1996-September/000232.html14:21
mlavalleand yes IPv6 ND is over L3, but the effect of it goes to L214:21
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haleybanyways...14:22
slaweqok, but getting back to nowadays :P14:23
haleybslaweq: you raised a good point about the Neighbor Advertisement, does the router need to send one when it adds the proxy entry?14:23
slaweqhaleyb: and also another question which I have - how it will work with L3HA routers during failover?14:24
haleybit's maybe not necessary, but without it there are edge cases like migration taking 30 seconds, etc14:24
haleybslaweq: seems like the same problem14:25
slaweqhaleyb: yes14:25
haleybthere is a daemon for linux, npd6, but i don't know how it works or if it applies14:26
slaweqhaleyb: are You talking about https://github.com/npd6/npd6 ?14:27
slaweqif so, it seems like dead project14:27
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haleybi was only looking at packages14:28
slaweq:)14:28
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haleybhttps://github.com/DanielAdolfsson/ndppd14:29
slaweqthx, this one looks better indeed14:29
haleybi thought we had looked at code to send proxy ND packets a while ago, thought maybe there was a way using packet generator code14:30
slaweqI think that those are in fact some implementation details which can be tested during implementation14:30
haleybbut i guess we need to add this to the spec since something is needed to support HA14:31
slaweqhmm, now I see one more thing which confuses me a bit14:32
slaweqin description there is sentence:14:32
slaweqIn external router we just need to add a static direct route, like this: 'ip route add 2001:400:1234:567:ffff::/80 dev fake-gw-port'.14:32
slaweqdoes it mean that we will need to interact somehow with some external routers?14:32
slaweqor what? haleyb do You know maybe?14:32
haleybwas that in the bug?14:32
mlavalleyes14:33
slaweqin the description14:33
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haleybhmm, i don't know if they meant the upstream router as the command was 'ip route add...'14:35
haleybi think the point is to not have to rely on the upstream router doing anything but learn neighbors and forward packets14:35
mlavalleI agree14:35
haleybhe would have to write up a spec to make it clear14:36
mlavalleyes14:37
amotokiin case of L3HA, I think we can assume two neutron routers and an upstream router belong to a same subnet, so I don't think the upstream router reconfigure its routing entry (via fake-gw-port)14:37
slaweqI agree that relying on the upstream router wouldn't be good in that case14:37
amotokiagree. it needs to beo clarified in the spec.14:37
njohnston+114:37
amotokis/beo/be/14:37
haleybi know i played with this years ago based on the patch I linked, in a production environment, and it did work, but it was just a manual test, and PD came along...14:38
mlavalleso it made it not worthwhile14:38
haleybright, i jumped on the PD train so to speak since it took care of the entire /6414:39
slaweqso should we approve this rfe with spec as next step to discuss technial details of implementation? or should we wait for spec now before we will approve (or not) the rfe? what do You think?14:40
mlavalleyes, in my opinion experimenting is good for Neutron and OpenStack in general14:40
slaweqIMO option 1 is ok but I want to know what others think :)14:40
mlavalleand I like this experiment14:40
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mlavalleI'm even willing to help14:41
mlavalleto write the spec and implement a PoC14:41
amotokisounds good to approve the RFE with spec and try PoC14:41
haleybyes, i'm ok given we write a good spec outlining the issues we've raised here, so someone can go look at solving them14:42
mlavalleyeap, experiment14:42
slaweqnjohnston: any thoughts?14:43
njohnstonThis aspect of IPv6 networking is not my strong suit but I am very interested to see how it works out14:44
slaweqok, so I will mark this rfe as approved, with comment that we first need spec which will answer for the questions which we had here14:45
mlavallecool14:45
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slaweqalso thx mlavalle for volunteering to help with this one :) I will include that in my summary also :)14:46
mlavalleslaweq: cool, thanks14:46
slaweqok, so I think we are good for today14:47
slaweqanyone wants to discuss anything else today?14:47
amotokiwhat I could do today was just to follow the discussion and try to understand it well.... thanks all!14:47
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haleybnow we can get back to fixing the gate :-o14:48
slaweqok, thx a lot for attending the meeting, have a great day and weekend :)14:49
slaweqsee You all next week14:49
mlavalleyou too14:49
mlavalleo/14:50
ralonsohbye14:50
slaweq#endmeeting14:50
*** openstack changes topic to "OpenStack Meetings || https://wiki.openstack.org/wiki/Meetings/"14:50
amotokio/14:50
haleybo/14:50
openstackMeeting ended Fri May 15 14:50:01 2020 UTC.  Information about MeetBot at http://wiki.debian.org/MeetBot . (v 0.1.4)14:50
openstackMinutes:        http://eavesdrop.openstack.org/meetings/neutron_drivers/2020/neutron_drivers.2020-05-15-14.00.html14:50
openstackMinutes (text): http://eavesdrop.openstack.org/meetings/neutron_drivers/2020/neutron_drivers.2020-05-15-14.00.txt14:50
openstackLog:            http://eavesdrop.openstack.org/meetings/neutron_drivers/2020/neutron_drivers.2020-05-15-14.00.log.html14:50
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slaweqralonsoh: do You have 5 minutes to talk?15:01
slaweqralonsoh: https://meet.google.com/jyx-xtvj-rmr15:01
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