[MUD-Dev] DGN: Random questions about griefers

[Peter Harkins]

On Wed, Aug 31, 2005 at 07:24:02AM +0930, Mike Rozak wrote:

> I thought (and could be wrong) that you got the MAC address from
> the client, and that it wasn't sent in the IP data. If the code to
> get the MAC address is in my client, then it's susceptible to
> hackers again. Or am I missing something?

MAC addresses can be changed by the client for many but not all
cards.

On Linux, this is as simple as doing 'ifconfig eth0 hw ether
<newMAC>'.

Bugging a Windows XP guy, I'm told that there is sometimes an option
in the network adaptor's properties under the 'Advanced' tab.

The important thing is that not everyone knows this. Networking
students are commonly taught that MAC addresses are immutable. So
it's one more technique in the "imperfect but useful" category. Add
enough together...

--
Peter Harkins    -    ph at malaprop.org    -    http://malaprop.org
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