PR #23959 breaks consul ipv6 registration address

[42wim]

Nomad version

Nomad v1.9.7
BuildDate 2025-03-11T09:07:15Z
Revision f869597+CHANGES

Operating system and Environment details

Linux 4.18.0-553.46.1.el8_10.x86_64

Issue

After an upgrade from 1.7.7 to 1.9.7 we got an issue with our CNI containers and consul address registration.

#23959 changes the content of netstatus.Address, in our setup this was an IPv6 address inside the CNI bridge and it got registered correctly in consul.

Now this is an IPv4 address as the PR has split it into a netstatus.Address and netstatus.AddressIPv6.

And GetAddress with AddressModeAlloc now returns the ipv4 address

nomad/client/serviceregistration/address.go

Line 150 in 45dab2d

return netStatus.Address, 0, nil

Maybe there should be an option to specify to only use the IPv6 Address like with the docker driver

[jrasell]

Hi @42wim and thanks for raising this issue and the linked PR. I'll get this and the PR onto our backlog for review.

[jrasell]

Hi @42wim would it be possible to share the configuration you are using to generate the issue you're seeing (CNI plugins, client relevant config)? We had a quick internal chat about this and there was a question of whether client.preferred_address_family= ipv6 would achieve what you're looking for?