Public bug reported:
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
** Affects: ovn (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1949120
Title:
Missing PPMTUD for ICMP and UDP when there are dedicated gateways
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