Some popular applications and protocol/port numbers mapping are listed below:
Application | Protocol | Port Number |
Telnet | TCP | 23 |
FTP | TCP | 21 |
SMTP | TCP | 25 |
POP3 | TCP | 110 |
H.323 | TCP | 1720 |
SNMP | UDP | 161 |
SNMP Trap | UDP | 162 |
HTTP | TCP | 80 |
PPTP | TCP | 1723 |
PC Anywhere | TCP | 5631 |
PC Anywhere | UDP | 5632 |
Table
5.4.3 Special Applications
Some applications require multiple connections, such as Internet gaming and video conferencing. These applications cannot work when Network Address Translation (NAT) is enabled. If you need to run applications that require multiple connections, specify the port normally associated with an application in the "Trigger Port" field. Select the protocol type as TCP or UDP and then enter the public ports associated with the trigger port to open them for inbound traffic.
Figure
14
