> theoretically this is possible, but only if the original machine holding > the ip was down. just as a nameserver converts to an ip, the ip is converted > to a MAC-address, which is associated with the NIC. if you want you can > permantly associate an ip with a mac, that way another machine cannot use > that ip address, even if the rightful holder is down. see arp(8).
But wouldn't that be very easy to break? First I would scan the network for MACs and matching IPs, then I would spoof one at a time until I am out. How does one secure against MAC/IP spoofing? Is there a way to prevent this.
