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Observation¶

As brought up in https://mailman.suse.de/mlarch/SuSE/openvpn-info/2023/openvpn-info.2023.12/msg00022.html
there seems to be unexpected routing over outside routers which should stay within SUSE network. For example as observed on imagetester.qe.nue2.suse.org from tracepath worker40.oqa.prg2.suse.org

 1?: [LOCALHOST]                      pmtu 1500
 1:  10.168.195.254                                        0.126ms 
 1:  10.168.195.254                                        0.104ms 
 2:  10.168.195.254                                        0.136ms pmtu 1422
 2:  195.135.223.4                                         4.590ms 
 3:  worker40.oqa.prg2.suse.org                            4.775ms reached

I don't know the host 195.135.223.4 but it does not look like a SUSE internal host that should be in the path.

That also has a considerable impact on effective MTU size.

Reproducible¶

Reproducible on all non-PRG2 salt machines to PRG2

ssh osd "sudo salt \* cmd.run 'tracepath worker40.oqa.prg2.suse.org'"

Acceptance criteria¶

• AC1: The expected route has been clarified
• AC2: The impact of routing on MTU in openQA multi-machine tests is understood

Suggestions¶

• Find out together with Eng-Infra what route is expected, e.g. SD ticket