well i try to create a firewall or a simple filter upon the D-Link DI-704P.
so i try to block all the port except that i list below, accesing internet.
this is a normal port
1. port 80 , 8080, 3128 ( web, proxy)
2. Port 21 port Ftp
3. Port 23 Port Telnet
4. Port 22 Port ssh
5. port 6667 port Chat Mirc
6. port 5050 port Yahooo mesengger
ports other than the list above could be use by viruses or softwares.
but these are the complete list that i got from www.iana.org