Bug 2162083
| Summary: | [OSP17.0][OVN][MTU] IPv6 traffic ignores logical switch external_ids neutron:mtu and logical router port gateway_mtu settings | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux Fast Datapath | Reporter: | Miro Tomaska <mtomaska> |
| Component: | OVN | Assignee: | OVN Team <ovnteam> |
| Status: | CLOSED INSUFFICIENT_DATA | QA Contact: | Jianlin Shi <jishi> |
| Severity: | unspecified | Docs Contact: | |
| Priority: | high | ||
| Version: | FDP 22.G | CC: | ctrautma, ihrachys, jiji, lorenzo.bianconi, mmichels |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2023-02-06 16:41:22 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
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Description
Miro Tomaska
2023-01-18 17:56:22 UTC
(In reply to Miro Tomaska from comment #0) > It appears there is a regression from the BZ1846300 we have closed in 16.1. > According to testing mentioned in BZ1839847 comment 10 the issue still > repdroduces in RHOSP 17.0. > > To reproduce the issue follow comment#3 from BZ 1839847. I am going to paste > it here > > Reproducing steps: > I have virtual bridges on hypervisor allowing 9000 and all interfaces on > nodes allowing mtu 9000. > I configured external network with mtu set to 1500. > Test1 If I send a big ipv4 packet with size 8800 from vm on the internal > network it is not passing to the external network (dropped) - OK > Test2, If send a big ipv6 packet with size 8800 from vm on the internal > network it is passing to the external network (single big full size packet > just reaches) - not as expected, because configured neutron mtu and/or > logical switch external_ids neutron:mtu are ignored. > Test3, If I send a bigger ipv6 packet with size 8900 it is not reached (it's > expected) but path mtu discovery is not working (see tracepath6 output) - > not OK, according to the mail from Anita that you mentioned it is expected > to be working somehow ("MTU path discovery should already handle it"). But > as I wrote above we can create a separate BZ (RFE) for this issue. Are you using DVR scenario? If so, can you please check the configured MTU of the physical NICs used to access the underlay network (localnet interfaces)? If not, can you please check the MTU size of each interfaces used to carry geneve traffic? In both cases they should be over the gateway configured MTU (OVN gateway_mtu). Moreover, can you please share OVN nb/sb dbs? Hi Lorenzo, I discussed this issue with Slawek who mentioned in BZ18939847 comment#10 that he was able to reproduce it in 17.0 but does not remember the setup. Roman who originally filled the BZ does not also recall how to reproduce it. Finally, i was not able to reproduce it. I am just going to close this BZ as "insufficient data" The needinfo request[s] on this closed bug have been removed as they have been unresolved for 120 days |