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VG211R User Manual
on the requested service (TCP/UDP), the VG211R redirects the external service request to the
appropriate server.
Some of the popular applications and protocol/port numbers mapping are defined below:
Application
Protocol
Port Number
Telnet
TCP
23
FTP
TCP
21
SMTP
TCP
25
POP3
TCP
110
H.323
TCP
1720
SNMP
UCP
161
SNMP Trap
UDP
162
HTTP
TCP
80
PPTP
TCP
1723
PC Anywhere
TCP
5631
PC Anywhere
UDP
5632
4.5.3. Special Application
Some applications require multiple connections, such as Internet gaming, video conferencing, Internet
telephony and others. 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, then
enter the public ports associated with the trigger port to open them for inbound traffic.
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