[Bug 252596] ping to 255.255.255.255 does not set broadcast MAC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252596

--- Comment #8 from Mike Karels <karels@freebsd.org> ---
I have mixed feelings about restoring the checks for INADDR_BROADCAST and
INADDR_ANY.  The problem with a send to 255.255.255.255 for a broadcast is that
it doesn't allow any way to select the outgoing interface.  The in(4) man page
is out of date on this; the interface selection is now done via routing.  This
means that a send to 255.255.255.255 would often follow the default route,
which may or may not be right.  A more explicit route can be added, although
that seems like a poor way to control an application, and only allows one
interface to be used.  The application already needs to set the SO_BROADCAST
option; setting IP_ONESBCAST and providing a way to specify the destination
address doesn't seem like a big increment.  Granted, ping will not have a way
to do this, but that doesn't seem like a very important use case.

If the change you cited was made recently, I might be more worried about
compatibility.  But it was made almost 6 years ago.

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