NAT broken for tenant VMs

Solution In Progress - Updated -

Issue

  • VMs attached to newly created tenant networks can no longer access outside networks via NAT.

  • This was working last week. We first noticed a problem when a 2nd router was created under the same project (to serve a different network). As we were doing additional testing to gather additional information on this behavior, we watched the situation deteriorate. Currently, newly created tenant networks can not use NAT.

  • When rebooting one of the controllers, connectivity works for those broken VMs but as soon as the rebooting controller comes back up, connectivity breaks again.

Environment

  • Red Hat OpenStack Platform 16.2 (RHOSP)

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