Or from a router on the network, a sample:
To determine the corresponding IP address for this MAC address, run the following DOS networking command in a DOS window:
This displays the IP address of all connected machines.
Match up the net_address value from the sysprocesses query (step 1) with the corresponding Physical Address in the arp -a results (step 2) to determine the IP address corresponding to the Physical Address is the IP address of the machine running the blocking process. To find the corresponding hostname of this machine, run the following DOS networking command in a DOS window:
ping -a <IPaddress>
In the command above, <IPaddress> indicates the IP address identified with the arp -a command.