Owner's Manual

Protecting Your Network
38
N300 Wireless Gigabit ADSL2+ Modem Router DGN3500
Remember that allowing inbound services opens holes in your firewall. Enable only those
ports that are necessary for your network. Following are two application examples of inbound
rules.
Inbound Rule Example: A Local Public Web Server
If you host a public Web server on your local network, you can define a rule to allow inbound
Web (HTTP) requests from any outside IP address to the IP address of your Web server at
any time of day. This rule is shown in the following figure:
Figure 18.
The settings are:
• Service. F
rom this list, select the application or service to be allowed or blocked. The list
already displays many common services, but you are not limited to these choices. Use
the Services screen to add any additional services or applications that do not already
appear. See How to Change the Built-In Password on p
age 33.
• Action. Cho
ose how you want this type of traffic to be handled. You can block or allow
always, or you can block or allow according to the schedule you have defined in the
Schedule screen.
• Send to L
AN Server. Enter the IP address of the computer or server on your LAN that
will receive the inbound traffic covered by this rule.
• W
AN Users. These settings determine which packets are covered by the rule, based on
their source (WAN) IP address. Select the option that you want:
- Any: All IP addre
sses are covered by this rule.
- Address range: If this op
tion is selected, you must fill in the Start and Finish fields.
- Single a
ddress: Enter the required address in the Start field.