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Configuring For Virtual Servers Within LAN
If there is a web server and/or mail server behind the router, you may need to direct traffic from the public WAN port to within your network. This can be done by going to the Services folder, click on NAT and under the NAT Options select NAT Rule Entry.
Click Add to add a virtual port mapping, NAPT, port mapping or whatever term you may use. For D-Link, it is known as redirect. In DSL500G, it is abbreviated as RDR under the drop down list.
Give the entry a Rule ID, normally it would be the next number from the last rule. IF Name is the name of the interface to apply for the rule, just leave it as All.
For Protocol, it would be TCP if you are mapping HTTP, SMTP, POP3 or other TCP-based protocol.
The useful feature about DLink's DSL500G is its ability to specify a range for the local address. This would be important for failover support. Thus in case if one of the servers is down the packets will be attempted delivery to the next server in sequence.
The Local Address From would be the start of the internal IP address range and the Local Address To would be the last IP address to attempt delivery.
The Global Address From & Local Address TO serves the same purpose be would only be meaningful if you have more than one public IP address.
The Destination Port From & Destination Port To would be the range of ports to be accepted & redirect to the local address range above.
The final entry, the Local Port would be the non-standard port that you may want to redirect to if it is not the same as the destination port stated.
What is lacking in documentation is make up for by the features found in this supposedly entry level router.
Another of D-Link router that is value for money would be the DI724+ Wireless Router, which does not have the built-in modem but is just as impressive on features.
D-Link DSL500G Review | D-Link DSL500G Port Mapping
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