[Bug 278338] bhyve deletes tap LINK0 flag (regression)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=278338

crest@rlwinm.de changed:

           What    |Removed                     |Added
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                 CC|                            |crest@rlwinm.de

--- Comment #1 from crest@rlwinm.de ---
It's expected that a tap interface goes down if you close it causing the
addresses and routes to removed. It's annoying for a routed bhyve setup, but
can be avoided by using the vmnet cloner instead of the tap cloner to create
your interfaces.

You should be able to get the behaviour I assume you want for a routed bhyve
deployment from vmnet. I'm not sure what's the correct way to deal with the
link0 flag if the tap interface is already configured before bhyve opens it. I
can see arguments both way (trusting the user to really know and intentionally
set each bitfield they twiddled with vs. bringing the device into its default
configuration to clean up any corrupted state left over from the previous
opening of the device by some other software that also used tap0). The only way
to cover both cases would probably to add one more configuration option similar
to noinit for serial ports.

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