User's Manual

42 | Chapter 4. Content Filtering Settings
N750 Wireless Dual Band Gigabit Router WNDR4300 User Manual
- Days specifies which day of the week to send the log. This is relevant when the log is
sent weekly.
- Time specifies the time of day to send the log. This is relevant when the log is sent
daily or weekly.
Note: If the Weekly, Daily, or Hourly option is selected and the log fills up
before the specified period, the log is automatically emailed to the
specified email address. After the log is sent, it is cleared from the
router’s memory. If the router cannot email the log file, the log buffer
might fill up. In this case, the router overwrites the log and discards
its contents.
Port Forwarding
Because the router uses Network Address Translation (NAT), your network presents only one
IP address to the Internet, and outside users cannot directly address any of your local
computers. However, with port forwarding you can make a local server (for example, a Web
server or game server) visible and available to the Internet.
Note: Some residential broadband ISP accounts do not let you run server
processes (such as a Web or FTP server) from your location. Your
ISP might periodically check for servers and suspend your account if
it discovers any active services at your location. If you are unsure,
refer to the acceptable use policy of your ISP.
Port forwarding tells the router to direct inbound traffic for a particular service to one local
server based on the destination port number. Port forwarding opens holes in your firewall.
Enable only those ports that are necessary for your network.
Before starting, you need to determine which type of service, application, or game you will
provide, and the local IP address of the computer that will provide the service. Be sure the
computer’s IP address never changes.
The following are some considerations for port forwarding:
• If your external IP address is assigned dynamically by your ISP, the IP address might
change periodically as the DHCP lease expires. Consider using the Dynamic DNS screen
described in Dynamic DNS so that external users can always find your network.
• If the IP address of the local server computer is assigned by DHCP, it might change when
the computer is rebooted. To avoid this, use the Reserved IP address feature in the LAN
Setup screen to keep the computer’s IP address constant.