[Bug 199136] [if_tap] Added down_on_close sysctl variable to tap(4)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=199136

Gleb Smirnoff <glebius at FreeBSD.org> changed:

           What    |Removed                     |Added
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             Status|New                         |Open
                 CC|                            |glebius at FreeBSD.org

--- Comment #7 from Gleb Smirnoff <glebius at FreeBSD.org> ---
I'm strongly against the sysctl, and reasons are same as before. Sysctl knob is
global. You can make it per-vnet, but your patch lacks that. You could even
make it per-interface, but that would require quite a lot of extra code.

The IFF_LINK flag is a lesser patch, and immediately gives you a per-interface
configuration granularity, which of course implies per-vnet. Setting flag in
rc.conf requires same efforts as putting a line in sysctl.conf.

Changing the default is different question, and should be discussed separately.

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