Influencing IPv6 source address selection

[michaelbeaumont]

Hi, this is a niche use case but maybe opens an interesting question on how to generalize tweaking these kinds of things. I'm trying to influence which source IPv6 address is used in certain cases and normally I'd do this using ip addrlabel. In particular, I need to do this from boot so the obvious privileged container isn't an option. Normally I'd use a kernel parameter a la sysctl.net.ipv6 but address labels aren't exposed this way. Is there a way I can do this right now or is there a coherent feature to request to enable this?

[smira]

We don't have a support for that, but if you could drop some notes/examples to #10957, that would help.