Advanced Features

57

Communication Applications

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-BRF114U'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

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

Figure 39: Special Applications Screen

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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.

If an application still cannot function correctly,

try using the "DMZ" feature.

Multi-DMZ

This feature, if enabled, allows one (1) or more computers on your LAN to be exposed to all

users on the Internet (if you only have 1 WAN IP addresses, only DMZ 1 can be used), allow-

ing 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.

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The "DMZ PC" is effectively outside the Firewall, mak-

ing it more vulnerable to attacks. For this reason, you

should only enable the DMZ feature when required.

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.

URL Filter Screen

Click the "Configure URL Filter" button on the

Internet

screen to access the

URL Filter

screen.

An example screen is shown below.

Figure 40: URL Filter Screen

Data - URL Filter Screen

Filter Strings

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.

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Buttons

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.

Virtual Servers

This feature 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 41: 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.

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Virtual Servers Screen

The

Virtual Servers

screen is reached by the

Virtual Servers

link on the

Advanced

screen. An

example screen is shown below.

Figure 42: Virtual Servers Screen

This screen lists a number of pre-defined Servers, and allows you to define your own Servers.

Details of the selected Server are shown in the "Properties" area.

Data - Virtual Servers Screen

Servers

Servers

This lists a number of pre-defined Servers, plus any Servers you

have defined. Details of the selected Server are shown in the

"Properties" area.

Properties

Enable

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

•

If Enabled, any incoming connections will be forwarded to the

selected PC.

•

If Disabled, any incoming connection attempts will be blocked.

PC (Server)

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

priate Server software.

Protocol

Select the protocol (TCP or UDP) used by the Server.

Internal Port No.

Enter the port number which the Server software is configured to

use.

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