On Mon, 01 Nov 1999 12:02:12 +0900 
 itojun@iijlab.net wrote:

 > 	I'm just curious, which application uses BIOC[GS]HDRCMPLT?
 > 	(allows you to inject layer 2 header on bpf writes)
 > 	Or is it mainly for experiments?  It looks it was added between
 > 	1.39 to 1.40.

It's for implementing protocols in userspace which require "spoofing"
the MAC source address... e.g. some Cisco bridge-bridge communication
protocols, Apollo Netman, etc.

        -- Jason R. Thorpe <thorpej@nas.nasa.gov>