hi list I'm configuring a firewall on dhcp server, i'm a bit confuse which port to allow on INPUT that users (clients) get IP from the server from /etc/sevices... bootps 67/tcp dhcps #Bootstrap Protocol Server bootps 67/udp dhcps #Bootstrap Protocol Server bootpc 68/tcp dhcpc #Bootstrap Protocol Client bootpc 68/udp dhcpc #Bootstrap Protocol Client dhcpv6-client 546/tcp #DHCPv6 Client dhcpv6-client 546/udp #DHCPv6 Client dhcpv6-server 547/tcp #DHCPv6 Server dhcpv6-server 547/udp #DHCPv6 Server lot of other services do runnig on this machine, however i'm very clear about all other services, ie which port to allow etc All the client machines are running MS. Therefore any other good suggestion will be appreciated to machine the network efficient. regards Askar -- Unix is very simple, but it takes a genius to understand the simplicity. (Dennis Ritchie)