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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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Broadband Router User Guide
58
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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Advanced Features
59
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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Broadband Router User Guide
60
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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Advanced Features
61
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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