[Bug 1966981] Re: [hwol] centralized gateway NAT non-functional

[Frode Nordahl]

** Summary changed:

- Gateway router NAT non-functional for OVN 22.03
+ [hwol] centralized gateway NAT non-functional

** Summary changed:

- [hwol] centralized gateway NAT non-functional
+ [hwol] centralized gateway NAT mangles source address

** Description changed:

- I currently do not have all the details, but I do know that OVN 21.12
- and 22.03 brings a regression as to how NAT is processed for CMS'es that
- make use of gateway routers, such as OpenStack.
+ When hardware offload is enabled, CMS configures gateway routers and
+ centralized NAT, the source address of packets flowing through the
+ gateway are mangled after the connection preamble, not allowing the
+ connection to form.
  
- We've tracked the regression down to a single commit [0].
+ When disabling hardware offload completely the problem goes away.
+ 
+ Running ovn-northd without [0] also makes the problem go away.
  
  0: https://github.com/ovn-
  org/ovn/commit/4deac4509abbedd6ffaecf27eed01ddefccea40a

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

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https://bugs.launchpad.net/bugs/1966981

Title:
  [hwol] centralized gateway NAT mangles source address

Status in ovn package in Ubuntu:
  Triaged

Bug description:
  When hardware offload is enabled, CMS configures gateway routers and
  centralized NAT, the source address of packets flowing through the
  gateway are mangled after the connection preamble, not allowing the
  connection to form.

  When disabling hardware offload completely the problem goes away.

  Running ovn-northd without [0] also makes the problem go away.

  0: https://github.com/ovn-
  org/ovn/commit/4deac4509abbedd6ffaecf27eed01ddefccea40a

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