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Date:      Wed, 19 Apr 2023 03:30:18 +0000
From:      bugzilla-noreply@freebsd.org
To:        net@FreeBSD.org
Subject:   [Bug 235920] ifconfig: unable to create another interface after renaming the previous one with the same name
Message-ID:  <bug-235920-7501-xXxaDKKcKL@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-235920-7501@https.bugs.freebsd.org/bugzilla/>
References:  <bug-235920-7501@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D235920

Kyle Evans <kevans@freebsd.org> changed:

           What    |Removed                     |Added
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                 CC|                            |kevans@freebsd.org

--- Comment #5 from Kyle Evans <kevans@freebsd.org> ---
(In reply to Zhenlei Huang from comment #4)

> When an interface is renamed, its unit number is not `freed` and thus lea=
d this problem.

Right, as soon as you start renaming the concept of a unit number can so ea=
sily
fade away that it's not worth the complexity trying to manage it.

# ifconfig tun0 name sillytun

I suddenly have no unit number because there's not such a constraint on nam=
es,
and imposing one would seem to be a bit weird. At some point, you converge =
on
restricting renames to maintaining the common prefix so that, e.g., tun0 ->
openvpn0 (bad example, but you can see where I'm going with this) wouldn't =
be
be possible because you don't want to maintain the arbitrary "openvpn"  or
whatever unr space as well.

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