Internet Features

43

Communication Applications

Most applications are supported transparently by the TW100-BRV204. But sometimes it is not

clear which PC should receive an incoming connection. This problem could arise with the

Communication Applications

listed on this screen.

If this problem arises, you can use this screen to set which PC should receive an incoming

connection, as described below.

Select an Application

This lists applications which may generate incoming connections,

where the destination PC (on your local LAN) is unknown.

Send incoming calls to

This lists the PCs on your LAN.

•

If necessary, you can add PCs manually, using the "PC

Database" option on the advanced menu.

•

For each application listed above, you can choose a destina-

tion PC.

•

There is no need to "Save" after each change; you can set the

destination PC for each application, then click "Save".

Special Applications

If you use Internet applications which use non-standard connections or port numbers, you may

find that they do not function correctly because they are blocked by the TW100-BRV204 's

firewall. In this case, you can define the application as a "Special Application".

Special Applications Screen

This screen can be reached by clicking the

Special Applications

button on the

Advanced

Internet

screen.

You can then define your Special Applications. You will need detailed information about the

application; this is normally available from the supplier of the application.

Also, note that the terms "Incoming" and "Outgoing" on this screen refer to traffic from the

client (PC) viewpoint

TW100-BRV204 User Guide

44

Figure 28: Special Applications Screen

Data - Special Applications Screen

Checkbox

Use this to Enable or Disable this Special Application as required.

Name

Enter a descriptive name to identify this Special Application.

Incoming

Ports

•

Type

- Select the protocol (TCP or UDP) used when you receive data

from the special application or service. (Note: Some applications use

different protocols for outgoing and incoming data).

•

Start

- Enter the beginning of the range of port numbers used by the

application server, for data you receive. If the application uses a single

port number, enter it in both the "Start" and "Finish" fields.

•

Finish

- Enter the end of the range of port numbers used by the applica-

tion server, for data you receive.

Outgoing

Ports

•

Type

- Select the protocol (TCP or UDP) used when you send data to

the remote system or service.

•

Start

- Enter the beginning of the range of port numbers used by the

application server, for data you send to it. If the application uses a sin-

gle port number, enter it in both the "Start" and "Finish" fields.

•

Finish

- Enter the end of the range of port numbers used by the applica-

tion server, for data you send to it. If the application uses a single port

number, enter it in both the "Start" and "Finish" fields.

Using a Special Application

•

Configure the

Special Applications

screen as required.

•

On your PC, use the application normally. Remember that only one (1) PC can use each

Special application at any time. Also, when 1 PC is finished using a particular Special Ap-

plication, there may need to be a "Time-out" before another PC can use the same Special

Application. The "Time-out" period may be up to 3 minutes.

Internet Features

45

DMZ

This feature, if enabled, allows one (1) computer on your LAN to be exposed to all users on

the Internet, allowing unrestricted 2-way communication between the "DMZ PC" and other

Internet users or Servers.

•

This allows almost any application to be used on the "DMZ PC".

•

The "DMZ PC" will receive all "Unknown" connections and data.

•

If the DMZ feature is enabled, you must select the PC to be used as the "DMZ PC".

•

The DMZ feature can be Enabled and Disabled on the

Advanced Internet

screen.

URL Filter

The URL Filter allows you to block access to undesirable Web site

•

To use this feature, you must define "filter strings". If the "filter string" appears in a

requested URL, the request is blocked.

•

Enabling the

URL Filter

also affects the Internet

Access Log

. If Enabled, the "Destination"

field in the log will display the URL. Otherwise, it will display the IP Address.

•

The

URL Filter

can be Enabled or Disabled on the

Advanced Internet

screen.

TW100-BRV204 User Guide

46

URL Filter Screen

Click the "Configure URL Filter" button on the

Advanced

Internet

screen to access the

URL

Filter

screen. An example screen is shown below.

Figure 29: URL Filter Screen

Data - URL Filter Screen

Current Entries

This lists any existing entries. If you have not entered any values, this

list will be empty.

Add Filter String

To add an entry to the list, enter it here, and click the "Add" button.

An entry may be a Domain name (e.g. www.trash.com) or simply a

string. (e.g. ads/ )

Any URL which contains ANY entry ANYWHERE in the URL will

be blocked.

Delete/Delete All

Use these buttons to delete the selected entry or all entries, as required.

Multiple entries can be selected by holding down the CTRL key while

selecting. (On the Macintosh, hold the SHIFT key while selecting.)

Add

Use this to add the current Filter String to the site list.

Internet Features

47

Dynamic DNS (Domain Name Server)

This free service is very useful when combined with the

Virtual Server

feature. It allows

Internet users to connect to your Virtual Servers using a URL, rather than an IP Address.

This also solves the problem of having a dynamic IP address. With a dynamic IP address, your

IP address may change whenever you connect, which makes it difficult to connect to you.

The Service works as follows:

1.

You must register for the service at http://www.dyndns.org (Registration is free). Your

password will be E-mailed to you.

2.

After registration, use the "Create New Host" option (at www.dyndns.org) to request your

desired Domain name.

3.

Enter your data from www.dyndns.org in the TW100-BRV204 's DDNS screen.

4.

The TW100-BRV204 will then automatically ensure that your current IP Address is

recorded at http://www.dyndns.org

5.

From the Internet, users will be able to connect to your Virtual Servers (or DMZ PC)

using your Domain name, as shown on this screen.

Dynamic DNS Screen

Select

Internet

on the main menu, then

Dynamic DNS

, to see a screen like the following:

Figure 30: DDNS Screen

Data - Dynamic DNS Screen

DDNS Service

•

You must sign up first to create a new account before using the

service. The service is free.

•

Click this link to connect to the www.dyndns.org Web site.

•

Your initial password will be E-mailed to you; you can change

this later if you wish.

•

After registration, use the "Create New Host" link (on the

www.dyndns.org Web site) to request a domain name.