X Server arp table

Hi All

First post, hopefully an easy one......
I have an OS X Server on my lan here to which a number of OS 9 clients connect. I've had intermittant problems mapping drives on the client side which by pure blind luck i've traced back to the arp table on the server. The server appears to add any new addresses to this table as permanent entries so when one of the clients changes ip address (DHCP) the only way to fix the problem is to manually delete the arp entry. Has anyone come accross something similar and if so is there any fix? I've read the man page but there's no refreence to this kind of problem.

The server version is: Darwin xserver 5.2.2 Darwin Kernel Version 5.2.2:

Thanks in advance