Great Circle Associates Firewalls
(October 1994)
 

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Subject: Re: NIC board six byte ids
From: Peter . Samuel @ nms . otc . com . au (Peter Samuel)
Date: Tue, 25 Oct 1994 13:28:14 +1000 (AEST)
To: firewalls @ greatcircle . com
In-reply-to: <783049962snx @ nemesys . com> from "Granville Moore" at Oct 24, 94 06:52:42 pm
Organisation: Telstra Corporation Ltd
Phone: +61-2-339-3953, Fax: +61-2-339-3688

Granville Moore writes:
 > 
 > In article <9410220208 .
 AA14307 @
 uvs1 .
 orl .
 mmc .
 com> you write:
 > > Granville rites:
 > > >Although this might help to track down individuals in some cases,
 > > >it can't be relied upon.  Some boards implement this address
 > > >in hardware, but some allow it to be changed by software.
 > > >It certainly shouldn't be used as a secure method of authentication.
 > > 
 > > True - on a VAX it is relatively easy (have written device drivers before 8*),
 > > on a Sun it may be possible (sure someone will say if so, have only had
 > > admin training), know of no way to do it on a PC or MAC without changing the
 > > ROM.
 > 
 > On the contrary - it is very easy to do on most PC cards.  I have a small
 > piece of software that has worked on every board that I've tried it on.
 > 
 > It wouldn't surprise me if it's just as easy to do on a Mac.  Suns might
 > be more difficult, but I wouldn't rely on it!
 > 
 > Regards,
 > 
 > Granville
 > 
 > 
 > ========================================================================
 > Granville Moore                                          gvm @
 nemesys .
 com
 > Nemesys Computer Consultants Ltd
 > System Security Specialists
 > I am not an accountant!  I am a free man!
 > ========================================================================
 > 

Simple to do on a Sun:

    ifconfig le0 ether 8:0:20:x:y:z

or any other 6 byte string you'd care to use.

You can also achieve the same through access to /dev/nit and library
calls (which is of course how ifconfig does it).

Regards
Peter
----------
Peter Samuel                                peter @
 uniq .
 com .
 au
Technical Consultant                        or at present:
Uniq Professional Services                  Peter .
 Samuel @
 nms .
 otc .
 com .
 au
Phone: +61 2 339 3843                       Fax: +61 2 339 3688



References:
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