Advanced Features

Virtual Servers

This feature, sometimes called Port Forwarding, allows you to make Servers on your LAN accessible to Internet users. Normally, Internet users would not be able to access a server on your LAN because:

Your Server does not have a valid external IP Address.

Attempts to connect to devices on your LAN are blocked by the firewall in this device.

The "Virtual Server" feature solves these problems and allows Internet users to connect to your servers, as illustrated below.

Figure 42: Virtual Servers

IP Address seen by Internet Users

Note that, in this illustration, both Internet users are connecting to the same IP Address, but using different protocols.

To Internet users, all virtual Servers on your LAN have the same IP Address. This IP Address is allocated by your ISP.

This address should be static, rather than dynamic, to make it easier for Internet users to connect to your Servers.

However, you can use the DDNS (Dynamic DNS) feature to allow users to connect to your Virtual Servers using a URL, instead of an IP Address.

Virtual Servers Screen

The "Virtual Servers" feature allows Internet Users to access PCs on your LAN.

The PCs must be running the appropriate Server Software.

For Internet Users, ALL of your Servers have the same IP address. This IP address is allocated by your ISP.

To make it easier for Internet users to connect to your Servers, you can use the "DDNS" feature. This allows Internet users to connect to your Servers with a URL, rather than an IP address. This technology works even if your ISP allocates dynamic IP addresses (IP address is allocated upon connection, so it may change each time you connect).

Broadband ADSL Router User Guide

Figure 43: Virtual Servers Screen

Data - Virtual Servers Screen

Servers

Servers

This lists a number of common Server types. If the desired Server

 

type is not listed, you can create a Firewall Rule to achieve the

 

same effect as the Virtual Server function.

 

 

Properties

 

Enable

Use this to Enable or Disable support for this Server, as required.

 

If Enabled, you must select the PC to which this traffic will be sent.

 

Select the PC for this Server. The PC must be running the appro-

PC (Server)

 

priate Server software.

 

 

For each entry, the PC must be running the appropri- ate Server software.

If the desired Server type is not listed, you can define your own Servers, using the Firewall Rules.

Connecting to the Virtual Servers

Once configured, anyone on the Internet can connect to your Virtual Servers. They must use the Internet IP Address (the IP Address allocated to you by your ISP).

e.g.

http://203.70.212.52

ftp://203.70.212.52

It is more convenient if you are using a Fixed IP Address from your ISP, rather than Dynamic. However, you can use the Dynamic DNS feature to allow users to connect to your Virtual Servers using a URL, rather than an IP Address.

From the Internet, ALL Virtual Servers have the IP Address allocated by your ISP

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TRENDnet BRM504 manual IP Address seen by Internet Users, Virtual Servers Screen, Connecting to the Virtual Servers

BRM504 specifications

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