[Bug 235920] ifconfig: unable to create another interface after renaming the previous one with the same name

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235920

--- Comment #7 from Zhenlei Huang <zlei@FreeBSD.org> ---
(In reply to Franco Fichtner from comment #6)
> And tun/tap is a little tricky in its own regard here since the device nodes that
> may be required by the service are never being renamed (/dev/tunX etc.).

Yes, you are right.

For tap(4), even its unit number is freed the original controller device should
still exist so that the applications (which have opened the /dev/tap) will not
be disturbed.

I'm proposing UUID naming to fix that. Please see
https://reviews.freebsd.org/D39689 .

For the design of tap(4), why not create `/dev/tap/some-uuid-name` and an alias
`/dev/tap0 -> /dev/tap/some-uuid-name` ?

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