Description

Reported by @uweber at:

• Wait for a route to ff02::1 before sending NAs #49392 (comment)

FYI: This broke our high availability container setup.
We attach two ethernet interfaces via macvlan to a container, where only on interface has link state up at a time.
Since one interface has no physical link, the interface has no working IPv6 address and setup fails with:
failed to set up container networking: failed to add interface vethcc2aa94 to sandbox: failed to advertise addresses: write ip ::1->ff02::1: sendmsg: network is unreachable

Reproduce

See description.

Expected behavior

No response

docker version

28.0.1, detail not available.

docker info

Not available.

Additional Info

No response