[Bug 210049] jails mishandle the default lo0 127.0.0.1 loopback interface

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210049

--- Comment #3 from crest@rlwinm.de ---
Alias jails map 127.0.0.1 (and ::1) to their primary alias IP address per
address family. This can be quite useful to intentionally expose a service
bound to a changing IP address per launch, but it can also expose services that
are only meant to listen to the loopback address which a jail with alias
networking doesn't have unless the loopback address is one of its alias IP
addresses. Documenting this behaviour more prominently is the best we can do
without breaking this double-edged feature.

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