[Bug 254343] 13.0-RC2: adding a vtnet (VirtIO network) interface to bridge fails

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254343

Felix Palmen <felix at palmen-it.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|13.0-STABLE                 |11.4-RELEASE

--- Comment #6 from Felix Palmen <felix at palmen-it.de> ---
(In reply to Aleksandr Fedorov from comment #4)
> Technically, if the hypervisor doesn't support the VTNET_FLAG_CTRL_RX, then
> the interface is always in PROMISC mode.

This is confirmed by my observation that adding the interface to the bridge
while it's down and bringing it up afterwards results in correct operation of
the bridge, in bhyve. This clumsy workaround also makes tcpdump work fine.

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