[Bug 238298] Unable to create TAP interfaces

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238298

            Bug ID: 238298
           Summary: Unable to create TAP interfaces
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: i386
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: freebsd at neilalexander.dev

Attempting to create a TAP interface on a freshly-installed FreeBSD
12.0-RELEASE (i386)  system seems to fail:

$ uname -a
FreeBSD server 12.0-RELEASE FreeBSD 12.0-RELEASE r341666 GENERIC  i386

$ ifconfig tap0 create
ifconfig: SIOCIFCREATE2: Invalid argument

Meanwhile it appears that creating tun0 (layer 3) instead of tap0 (layer 2)
does work.

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