dg d78e91c98d 1) Set interface up/down correctly as a function of open and close of the
SLIP device.
2) Don't directly frob the IFF_UP flag - use if_up/if_down as it was
   intended.
3) Return ENETDOWN if IFF_UP isn't set when outputing, drop the packet if
   if IFF_UP isn't set when inputing.
1995-06-21 08:48:19 +00:00
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