Snow Leopard: unwanted SNMP?

I'm seeing a lot of traffic from my SL Server to the subnet on port 162, which is SNMP I believe. (Traffic is going to 192.168.10.255:162 where my server is on that 192.168.10 subnet...) Any idea why and more importantly how to stop it? (It's causing some firewall perturbation that I'd like to remove, just to keep logfile traffic down if nothing else!) thanks in advance dave