From owner-freebsd-net  Tue Jul 27 11: 5:18 1999
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To: waskita adijarto <waskita@ee.itb.ac.id>
Cc: freebsd-net@freebsd.org
Subject: Re: writing raw ethernet packet in FreeBSD. 
In-reply-to: Your message of "Tue, 27 Jul 1999 11:44:33 +0700."
             <Pine.BSF.3.96.990727113713.4710C-100000@elka.ee.itb.ac.id> 
Date: Tue, 27 Jul 1999 11:02:18 -0700
From: "Gregory P. Smith" <greg@nas.nasa.gov>
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> I want to read & write raw ethernet packet. I can read raw ethernet
> packet with bpf, but writing to bpf device is not so successful. the
> ethernet source address always follow the interface's address. Is this the
> normal behavior of bpf ? I am thinking that I should look at
> /usr/src/sys/net/bridge.c  to create raw ethernet packet ...
> 
> My FreeBSD box is 2.2.8, my interface card is 3C509 (ep0) & ed0 (some
> NE2000 compatible)

It sounds like you want to write a -completely- raw packet using your
own ethernet address?  If so, look in the NetBSD bpf.h/bpf.c sources
for the BIOC{S,G}HDRCMPLT ioctls.  (it doesn't look like anyone ever
added this to FreeBSD; its real simple to apply)

It allows you to tell the Ethernet driver not to rewrite the device's
hardware address into the packet before sending it to the card.

Greg


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