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Watson-SHDSL-Router-Manual.doc

Version 1.1-07

Watson SHDSL Router

Operating Manual

Revision: 2012-02-15

3-5

additional public IP addresses to port forwarding rules, and enter into the 'NAT IP

Addresses Pool'. You will then be able to define FTP to use address X to reach

computer A and address Y to reach computer B.

Additionally, port forwarding enables you to redirect traffic to a different port in-

stead of the one to which it was designated. Lets say, that you have a Web serv-

er running on your PC on port 8080 and you want to grant access to this server

to anyone who accesses Watson SHDSL router via HTTP. To accomplish this,

do the following:

 Define a port forwarding rule for the HTTP service, with the PC's IP or host

name.

 Specify 8080 in the 'Forward to Port' field.

 All incoming HTTP traffic will now be forwarded to the PC running the Web

server on port 8080.

When setting a port forwarding service, you must ensure that the port is not al-

ready in use by another application, which may stop functioning.

Note: Some applications, such as FTP, TFTP, PPTP and H323, require the sup-

port of special specific Application Level Gateway (ALG) modules in order to

work inside the local network. Data packets associated with these applications

contain information that allows them to be routed correctly. An ALG is needed to

handle these packets and ensure that they reach their intended destinations.

Watson SHDSL router is equipped with a robust list of ALG modules in order to

enable maximum functionality in the local network.

The ALG is automatically assigned based on the destination port.

3.2.3 DMZ Host

The DMZ (Demilitarized) Host feature allows one local computer to be exposed

to the Internet. Designate a DMZ host when:

You wish to use a special-purpose Internet service, such as an on-line applica-

tion or video-conferencing program, that is not present in the Port Forwarding list

and for which no port range information is available.

You are not concerned with security and wish to expose one computer to all ser-

vices without restriction.

Warning: A DMZ host is not protected by the firewall and may be vulnerable to

attack. Designating a DMZ host may also put other computers in the local net-

work at risk. When designating a DMZ host, you must consider the security im-

plications and protect it if necessary.

An incoming request for access to a service in the local network, such as a Web-

server, is fielded by Watson SHDSL router. It will forward this request to the DMZ

host (if one is designated) unless the service is being provided by another PC in

the home network (assigned in Port Forwarding), in which case that PC will re-

ceive the request instead.

3.2.4 Port Triggering

Port triggering can be used for dynamic port forwarding configuration. By setting

port triggering rules, you can allow inbound traffic to arrive at a specific LAN

host, using ports different than those used for the outbound traffic. This is called

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