ARP.  Used to determine MAC from  IP.  Petri gives a great read, as usual, about ARP Cache.

To reduce arp broadcasts, you can add a static entry on clients.  This would be useful on an intranet with static servers.  **any chages to server network cards would invalidate the entry**

>arp -s 00-10-54-CA-E1-40
>arp -s 00-10-55-C5-E1-55

For the servers (2003), you may want to look at the ARP parameters.


 NOTE:  There is NO ArpCacheSize anymore.  This was depricated after NT server 3.1 !