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myGuard 7500GL 802.11g Security ADSL Router
Chapter 4:Configuration
Port Filters
The pre-defined port filter rules for High, Medium and Low security levels are listed. See
Table 1.
Table 1: Pre-defined 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) TCP(6) 119 119 NO NO NO
YES
NO
YES
RealAudio
(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.
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