Macsense Connectivity MIH-108 - Manual (Page 20)

Advanced configuration
17
Filter
In this part of the Intranet Setting menu, the IP Address Filter prevents
up to 5 local network clients from accessing certain services on the Internet
via the PalmRouter Elite. The specific types of Internet services to be filtered
are based on the TCP port numbers which these services use for communica-
tion.
Some well-known TCP port numbers are listed below:
Port number Service name
21 FTP
23 Telnet
25 SMTP
53 DNS
70 Gopher
80 HTTP
110 POP3
161 SNMP
Up to 5 TCP ports can be specified on the Filtered Private Ports setting.