On Mon, 19 Aug 2002, Patrick Hardeveld wrote:

> I have asked this one before but I did not recieve 1 reaction. I thought
> I try again. This is still the case: when I'm connected to the Internet
> and I do an arp -a command, it gives me a couple of (different ofcourse)
> ip-addresses with all the same mac-address. As we all know, every
> mac-address is unique so what I am seeing is impossible. I actually
> don't know what is causing this. Maybe a man in the middle attack??

Probably not...

In addition to what Mike has told you, you probably are seeing the effects 
of a proxy arp.  A router is giving you its ARP information for hosts on 
the other side of a connection.  Remember, true ARP information only 
exists on the locally connect LAN.  You don't get ARP information across 
links in a WAN.

Ed

-- 
http://www.shorewall.net/  for all your firewall needs
http://www.greshko.com     http://webcams.greshko.com



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