SMC Networks SMC Barricade Plus SMCBR18VPN - Manual (Page 29)

For example, if you have an FTP server (port 21) at 192.168.123.1, a Web server (port 80) at
192.168.123.2, and a VPN server at 192.168.123.6, you need to specify the following virtual
server mapping as shown in the table below:
Service Port Server IP Enable
21 192.168.123.1 X
80 192.168.123.2 X
1723 192.168.123.6 X
The “IP Address” section should contain the IP of the server computer in the LAN network that
will be providing the virtual services. The “Public Port” is the port number or port range on the
WAN side that will be used to access the virtual service. The “Private Port” is the port number of
the service used by the server computer. “Data Type” can be User Datagram Protocol (UDP),
Transmission Control Protocol (TCP) or both. This depends on the type of service you are
running. TCP is connection-oriented protocol and UDP is connectionless. Since most services are
connection-oriented, you will most likely need to select TCP. For example, FTP and HTTP are
connection-oriented services while DNS and many streaming radio servers are connectionless.
7.7.2 | Special Applications
Some applications require multiple connections, such as Internet games, video conferencing, and
Internet telephony. These applications cannot work with a pure NAT router because of the
firewall function. However, the Special Applications feature allows some of these applications to
work with the router. Should the Special Applications feature fail to make an application work,
you can try setting your computer as a DMZ host.
Trigger: This is the outbound port number issued by the application.
Incoming Ports: When the trigger packet is detected, the inbound packets sent to specified
port numbers are allowed to pass through the firewall.
The router provides some predefined settings. To add a predefined setting to your list, select an
application and click “Copy to”.
Note: Only one computer can use the Special Application tunnels at any given time.