Public bug reported:

At this point in time, with the 6.17.0-5.5 kernel and iproute2
6.16.0-1ubuntu2, the following OVN system tests fail on Questing:

    DNAT and SNAT on distributed router - N/S - IPv6
    Traffic to router port via LLA
    egress qos
    LR with SNAT fragmentation needed for external server

Downgrading iproute2 to 6.14.0-1ubuntu1 makes the following tests pass:

    egress qos

Mainline test with v6.16 and iproute2 6.14.0-1ubuntu1 makes all above
mentioned tests work.

Kernel/iproute2 from previous Ubuntu versions also make all above
mentioned tests work.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: ovn (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/2127061

Title:
  [questing][linux-6.17][iproute2] regression causing system test
  failures

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