Date: 14-01-03 00:45
if you just want to know which hosts/users are using the resource, setup dhcp to statically assign addresses based on the mac address... then setup dns, forward and reverse, to say what you want... user1.example.com or host2.example.com, etc...
also, how addresses are you serving via dhcp? if you only have 30 users, then is no reason to serve an entire class C through dhcp... resubnet you network to something more managable... then change samba's hosts allow directive to only allow from that subnet... use a /26 (255.255.255.192) will give you 62 addresses...
192.168.0.0 = network address
192.168.0.1-62 = usable addresses (this includes the gateway)
192.168.0.63 = broadcast address
then use 1-20 for servers, network equipment, etc...
21-62 for users.