Schmid Watson Technical Information download pdf (Page 52)

Watson SHDSL Router

Web-based Management Manual

Watson-SHDSL-Router-GUI-Manual.doc

Version 2.3-03

8-6

Revision: 2012-02-29

 Click the 'OK' button to save your changes and return to the 'Access Control'

screen.

You can disable an access control rule in order to make a service available without

having to remove the rule from the 'Access Control' screen. This may be useful if

you wish to make the service available only temporarily and expect that you will

want to reinstate the restriction in the future.

 To temporarily disable a rule, clear the check box next to the service name.

 To reinstate it at a later time, simply reselect the check box.

 To remove a rule, click the action icon for the service. The service will be

permanently removed.

Please note that when Web Filtering is enabled, HTTP services cannot be blocked by

Access Control.

8.2.3 Port Forwarding

In its default state, Watson blocks all external users from connecting to or com-

municating with your network. Therefore the system is safe from hackers who may

try to intrude on the network and damage it. However, you may want to expose

your network to the Internet in certain limited and controlled ways in order to enable

some applications to work from the LAN (game, voice and chat applications, for ex-

ample) and to enable Internet-access to servers in the home network. The Port

Forwarding feature supports both of these functionalities. If you are familiar with

networking terminology and concepts, you may have encountered this topic re-

ferred to as "Local Servers".

The 'Port Forwarding' screen enables you to define the applications that require

special handling by Watson. All you have to do is select the application's protocol

and the local IP address of the computer that will be using or providing the service.

If required, you may add new protocols in addition to the most common ones pro-

vided by Watson. For example, if you wanted to use a File Transfer Protocol (FTP)

application on one of your PCs, you would simply select 'FTP' from the list and en-

ter the local IP address or host name of the designated computer. All FTP-related

data arriving at Watson from the Internet will henceforth be forwarded to the speci-

fied computer.

Similarly, you can grant Internet users access to servers inside your home network,

by identifying each service and the PC that will provide it. This is useful, for exam-

ple, if you want to host a Web server inside your home network. When an Internet

user points his/her browser to Watson's external IP address, the gateway will for-

ward the incoming HTTP request to your Web server.

However, there is a limitation that must be considered. With one external IP ad-

dress (Watson's main IP address), different applications can be assigned to your

LAN computers, however each type of application is limited to use one computer.

For example, you can define that FTP will use address X to reach computer A and

Telnet will also use address X to reach computer A, but attempting to define FTP to

use address X to reach both computer A and B will fail. Watson therefore provides

the ability to add additional public IP addresses to port forwarding rules, which you

must first obtain from your ISP, and enter into the 'NAT IP Addresses Pool' (refer to

Section 8.2.7). You will then be able to define FTP to use address X to reach com-

puter A and address Y to reach computer B.

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