>We have a series of SNMP Agents and would like to ensure we can request data from a specific Agent. When using static IP's this does not present a problem. However, with the use of DHCP we can never be sure of the specific IP Address of a particular SNMP Agent. We could broadcast to all Agents and retrieve their IP Addressess as each responds. This may be the only approach but thought the solution would be much simpler if we could get a specifc IP from a previously stored MAC address..

No, you can't. A MAC address is specific to a particular Ethernet card; as you've already noticed in a DHCP environment, any of a range of IP addresses may be assigned to that card. In the general case the card's IP address will change from day to day (or boot to boot).

On the other hand, the NetBIOS name of the computer - or its hostname - rarely, if ever, changes. You might be able to make use of that. But, if you have SNMP already in place, using its properties is surely the way to go, is it not?