[Bug 275586] Undocumented feature of ifconfig UP

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275586

Kristof Provost <kp@freebsd.org> changed:

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                 CC|                            |kp@freebsd.org

--- Comment #1 from Kristof Provost <kp@freebsd.org> ---
It's not so much an undocumented feature as it is an unexpected result of a
documented feature.

What's happening here is that 'UP' is not 'up', so it's not recognised as a
command, but is being interpreted as a hostname:

     address
             For the inet family, the address is either a host name present in
             the host name data base, hosts(5), or an IPv4 address expressed in
             the Internet standard “dot notation”.

So ifconfig thinks you're trying to assign the name 'UP', so it resolves it,
which happens to work on your network and result in 192.41.170.42, which it
then assigns.

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