Thu Apr 01, 2010 10:28 pm
Needs more information. Is the client the only client behind the router? If there's other clients, are they statically or dynamically addressed?
The generic solution revolves around hard setting ARP tables instead of having them dynamically populate. If he's the only client, just turn off ARP on the interface and add a static entry. If there's other static clients, you'll need to add static entries for all of them. If there's other dynamic clients you'll have to enable the "add ARP entry" option on the DHCP server.