>Can somebody enlighten me: is it possible to change the
>ethernet [MAC, ie xx.xx.xx.xx.xx.xx] address of a network
>interface?
>
>It looks [from the ifconfig(8) manpage] like setting the
>ethernet address  should be possible in a similar way to
>setting IP address, but I can't seem to figure out the
>syntax.  [On linux boxen, I've previously done this with the
>"hw" option to ifconfig]
>
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Some time ago there was a discussion on the OpenBSD platform about this so
I've included an excerpt of a utility to set the MAC address on an
interface.
Has this one been ported to NetBSD yet?

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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D
/*  sea.c, v 1.0a2 1998/10/05 lone_wolf */

/*
 *  sea.c : set ethernet interface addresses on openbsd
 *  Copyright (c) 1998 lone_wolf (Fredrik Widlund) <fw@921i.se>
 *
[snip]
/*
 *  sea.c : set ethernet interface addresses on openbsd
 *
 *  Changes the hardware address for ethernet interface(s) on OpenBSD.
 *  Requires securelevel 0 to write to kernel memory.
 *
 *  Don't know which ethernet chips it will work on.
 *
 *  Takes affect instantly, which might confuse other hosts arp databases.
 *  Clearing the arp table will make us promote it in arp requests. Guess
 *  we should broadcast-publish ourself=8A
 *
 *  If you want to run it interactively (ie. not script it in /etc/rc) you
 *  must recompile a kernel with 'option insecure' in it, to allow the
 *  securelevel to remain at zero altitude.
 *
 *  Oh btw, this is not standard procedure. Dont blame me if it takes down
 *  your system. It is for OpenBSD *exclusively*. Try it on other platforms
 *  and they will most certainly crash.
 *
 *  Hacked if_ethersubr to keep mr. bsd off the eh for af_unspec, then
 *  noticed that the exact (letter for letter) patch had been used a year
 *  ago, for a couple of months, until deraadt ruled it out=8A I'll keep it
 *  though. It's still in the cvs tree, of course. Try it out.
 *
 *  v1.0a2 is hackerished and actually quite improved=8A
 *
 *  This is still fresh code, and probably filled with annoying creatures=8A

[snip]
I still have the mailfile so if anybody wants it let me know or do a search
for it on the OpenBSD archives etc.

BTW for why anybody wants to do this: remember the time that people had
privacyconcerns with PIII IDnumbers?
Same goes for encapsulating the MAC in traffic-headers.
Nad because nobody seems to protest about IPv6, which I think is rather
sad.there's a need for tools like that.

T@W

"Plato's Parameters"

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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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