Billion BIPAC 8500 User Manual page 106

Billion BIPAC-8500 / 8520 SHDSL VPN Firewall Bridge / Router
80 TCP
110 TCP
119 TCP
123 UDP
161 TCP
443 TCP & UDP
1503 TCP
1720 TCP
4000 TCP
7070 UDP
Because NAT can act as a "natural" Internet firewall, your router protects your network from
being accessed by outside users when using NAT, as all incoming connection attempts will
point to your router unless you specifically create Virtual Server entries to forward those ports to
a PC on your network. When your router needs to allow outside users to access internal servers,
e.g. a web server, FTP server, Email server or game server, the router can act as a "virtual
server". You can set up a local server with a specific port number for the service to use, e.g.
web/HTTP (port 80), FTP (port 21), Telnet (port 23), SMTP (port 25), or POP3 (port 110), When
an incoming access request to the router for a specified port is received, it will be forwarded to
the corresponding internal server.
Chapter 4: Configuration
World Wide Web HTTP
POP3 (Post Office Protocol Version 3)
NEWS (Network News Transfer Protocol)
NTP (Network Time Protocol)
SNMP
HTTPS
T.120
H.323
ICQ
RealAudio
102