> 
> I'll give it a try, although my answer is not authoritative...
> If PF_PACKET is Linux only, as I believe it is, it is unlikely that it 
> will be
> added in the default Unix library, which mostly conforms to Posix 
> standards.

from the packet(7) man page on my linux desktop:
NOTES
       For  portable  programs  it  is suggested to use PF_PACKET via
       pcap(3); although this only covers a subset of the PF_PACKET 
       features.


A module to interface to libpcap, (which runs on all UN*X hosts I know of)
might be an approach sufficiently general to be incorporated into the 
distribution. 


				-Kip

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