VoIP/(802.11g) ADSL2+ Router
Chapter 4: Configuration
Example: Predefined Port Filters Rules
The predefined port filter rules for High, Medium and Low security levels are listed. See Table 1.
(Note: Firewall – All Blocked/User-defined, you must define and create the port filter rules
yourself. No predefined rule is set)
Table 1: Predefined Port Filter
Port Number Firewall - High Firewall - Medium Firewall – Low
Application Protocol
Start End Inbound Outbound Inbound Outbound Inbound Outbound
HTTP(80) TCP(6) 80 80 NO YES NO YES NO YES
DNS (53) UDP(17) 53 53 NO YES NO YES YES YES
DNS (53) TCP(6) 53 53 NO YES NO YES YES YES
FTP(21) TCP(6) 21 21 NO NO NO YES NO YES
Telnet(23) TCP(6) 23 23 NO NO NO YES NO YES
SMTP(25) TCP(6) 25 25 NO YES NO YES NO YES
POP3(110) TCP(6) 110 110 NO YES NO YES NO YES
NEWS(119)
(Network News
Transfer
Protocol)
TCP(6) 119 119 NO NO NO YES NO YES
RealAudio/
RealVideo
(7070)
UDP(17) 7070 7070 NO NO YES YES YES YES
PING ICMP(1) N/A N/A NO YES NO YES NO YES
H.323(1720) TCP(6) 1720 1720 NO NO NO YES YES YES
T.120(1503) TCP(6) 1503 1503 NO NO NO YES YES YES
SSH(22) TCP(6) 22 22 NO NO NO YES YES YES
NTP(123) UDP(17) 123 123 NO YES NO YES NO YES
HTTPS(443) TCP(6) 443 443 NO NO NO YES NO YES
ICQ (5190) TCP(6) 5190 5190 NO NO NO NO YES YES
Inbound: Internet to LAN
Outbound: LAN to Internet.