small private school in eastern europe. setup - 20 w2k workstations, w2k server. Server acts as dns, adsl modem coonect to router/4port switch ( router acta as dhcp server). No firewal, no proxy, no caching, no monitoring. No money for anything!
Apply firewall rules on router? firewall ( e.g. zonealarm on pc's?
Anything else that can ve done?