[Bug 1949120] Re: Missing PMTUD for ingress traffic

[Frode Nordahl]

** Summary changed:

- Missing PPMTUD for ICMP and UDP when there are dedicated gateways
+ Missing PMTUD for ingress traffic

** Changed in: ovn (Ubuntu)
       Status: New => Triaged

** Changed in: ovn (Ubuntu)
   Importance: Undecided => High

** Also affects: ovn (Ubuntu Impish)
   Importance: Undecided
       Status: New

** Also affects: ovn (Ubuntu Hirsute)
   Importance: Undecided
       Status: New

** Also affects: ovn (Ubuntu Jammy)
   Importance: High
       Status: Triaged

** Also affects: ovn (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Changed in: ovn (Ubuntu Hirsute)
       Status: New => Triaged

** Changed in: ovn (Ubuntu Hirsute)
   Importance: Undecided => High

** Changed in: ovn (Ubuntu Focal)
       Status: New => Triaged

** Changed in: ovn (Ubuntu Focal)
   Importance: Undecided => High

** Changed in: ovn (Ubuntu Jammy)
       Status: Triaged => Fix Released

** Changed in: ovn (Ubuntu Impish)
       Status: New => Fix Released

** Changed in: ovn (Ubuntu Impish)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1949120

Title:
  Missing PMTUD for ingress traffic

Status in ovn package in Ubuntu:
  Fix Released
Status in ovn source package in Focal:
  Triaged
Status in ovn source package in Hirsute:
  Triaged
Status in ovn source package in Impish:
  Fix Released
Status in ovn source package in Jammy:
  Fix Released

Bug description:
  According to this bug[0] and these patches[1][2][3] the support to
  emit a ICMP "need to fragment" packet was added in ovn-21.09, Wallaby
  UCA carries ovn-20.12

  This limitation becomes a problem when the overlay network is
  configured to use jumbo frames and the external network uses a MTU of
  1500 .

  [Environment]

  Focal Wallaby with a dedicated ovn-chassis application to act as
  gateway

    ovn-chassis-gw:
      bindings:
        ? ''
        : oam-space
        data: overlay-space
      charm: cs:ovn-dedicated-chassis
      options:
        source: cloud:focal-wallaby/proposed
        bridge-interface-mappings: br-data:bond0.3811
        ovn-bridge-mappings: physnet1:br-data
        prefer-chassis-as-gw: true
      num_units: 2
      to:
      - 1001
      - 1002

  [0] https://bugzilla.redhat.com/show_bug.cgi?id=1547074#c5
  [1] https://github.com/ovn-org/ovn/commit/2c2f1802dcfc6f7d3e3a25a24e0b8f4c7c7f39d8
  [2] https://github.com/ovn-org/ovn/commit/1c9e46ab5c05043a8cd6c47b5fec2e1ac4c962db
  [3] https://github.com/ovn-org/ovn/commit/947e8d450ebaa8ce4ab81cb480a419618f1508c7

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