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ADSL2+ Modem Router DM111PSPv2 User Manual
3-8 Security and Firewall Protection
v1.0, December 2008
– Next to From Internet Host IP Address, select ALL (the default) to allow this service
to be used by everyone in your network. Otherwise, select SINGLE and enter the IP
address of one computer to restrict the service to a particular computer, or SUBNET
to restrict the service to a subnet.
– Next to Forward to Internal Host IP Address, enter the IP address of the internal host.
– To specify the rules, select the Protocol from the drop-down list, and fill in the
Starting Port and Ending Port fields. This information can be obtained from the
game or applications manual or the product’s support website.
4. When you are finished making changes, click Apply so that your changes take effect.
Port Triggering (Outbound Rules)
Port Triggering monitors outbound traffic. When the modem router detects traffic on the specified
outbound port, it remembers the IP address of the computer that sent the data and triggers the
incoming port. Port Triggering opens an incoming port temporarily and does not require the server
on the Internet to track your IP address if it is changed by DHCP, for example. Incoming traffic on
the triggered port is then forwarded to the triggering computer. Using the Port Triggering screen,
you can make local computers or servers available to the Internet for different services (for
example, FTP or HTTP), to play Internet games, or to use Internet applications.
Figure 3-5