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Can't use ULA addresses in NAT64 #1878

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hjensas
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@hjensas hjensas commented Jun 14, 2024

Ran into an issue where routing on the OCP cluster gets confused by the use of ULA addresses on the machine network.

OCP uses ULA addresses for internal networks, OVN kubernetes for example. When using ULA addressing on the machine network there is race when building the routing tables - and in some cases the hosts end up using the wrong source address in outgoing traffic.

To fix this, switch to GUA addresses.

As a pull request owner and reviewers, I checked that:

  • Appropriate testing is done and actually running
  • Appropriate documentation exists and/or is up-to-date:
    • README in the role
    • Content of the docs/source is reflecting the changes

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Thanks for the PR! ❤️
I'm marking it as a draft, once your happy with it merging and the PR is passing CI, click the "Ready for review" button below.

Ran into an issue where routing on the OCP cluster gets confused by the
use of ULA addresses on the machine network.

OCP uses ULA addresses for internal networks, OVN kubernetes for
example. When using ULA addressing on the machine network there is race
when building the routing tables - and in some cases the hosts end up
using the wrong source address in outgoing traffic.

To fix this, switch to GUA addresses.
@hjensas hjensas force-pushed the nat64-switch-addresses branch from f9d53ee to 3e57f50 Compare June 15, 2024 13:18
@hjensas hjensas marked this pull request as ready for review June 15, 2024 13:42
@cjeanner
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/approve

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openshift-ci bot commented Jun 18, 2024

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cjeanner

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@openshift-merge-bot openshift-merge-bot bot merged commit 1950573 into openstack-k8s-operators:main Jun 18, 2024
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@hjensas hjensas deleted the nat64-switch-addresses branch June 28, 2024 21:51
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3 participants