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Chapter 7
Internet Application

These features provides additional capabilities relating to the use of Internet software, including using Servers on your LAN.

Overview

The Internet Application screen provides access to some advanced features of the ISDN Internet Router. Selecting the Internet Application tab will display a screen like the example below.

Figure 17: Internet Tab

Special Applications

This feature is only required if you wish to use Internet applications which require 2-way communication, multiple connections, or combined TCP/UDP connections.

Operation

To use an existing entry:

To create a new entry:

  1. Click the Add button. A screen like the following will be shown.

    Figure 18: Special Application

  2. Enter data as described below.
  3. Click OK when finished. The new entry will appear in the list, and can be enabled and disabled like the pre-defined entries.

Data - Special Applications

Enable
Use this to Enable or Disable support for this application, as required.
Name
Enter a descriptive name to identify this application entry.

Outgoing Data

Protocol
The protocol (TCP or UDP) used when you connect to the special application service.
Port Range:
Start
The beginning of the range of port numbers used by the application server, for data you send to it. If the application uses a single port number, enter it in both the "Start" and "Finish" fields.
Port Range:
End
The end of the range of port numbers used by the application server, for data you send.

Incoming Data

Protocol
The protocol (TCP or UDP) used when the application or service sends data to you.
Port Range:
Start
The beginning of the range of port numbers used by the application server when data is sent to you. If the application uses a single port number, enter it in both the "Start" and "Finish" fields.
Port Range:
End
The end of the range of port numbers used by the application server, when data is sent to you.

Virtual Servers

Overview - Virtual Servers

The Virtual Servers feature allows Internet users to access Servers on your LAN, via the ISDN Internet Router. This feature is available only if you are using the ISDN Internet Router for shared Internet access, rather than for LAN-to-LAN connection.

Normally, Internet users would not be able to access a server on your LAN because:

The "Virtual Server" feature solves these problems and allows Internet users to connect to your servers. However, your LAN must have an existing connection to the Internet. Internet users cannot open a connection.

Virtual Server operation is illustrated below.

Figure 19: Virtual Server Operation

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 the IP Address from ISP on the Quick Setup screen. This address should be static (fixed), rather than dynamic, to make it easier for Internet users to connect to your Servers.

Using Virtual Servers

  1. Enable the Server type or types you wish to use.
    This can be done by double-clicking within the "Enable" column, to toggle the value On or Off.
    If creating or editing an entry, an Enable checkbox is available.
  2. Enter the IP Address of each server on your LAN.
  3. Click OK when finished.
  4. Advise Internet users of the IP Address to use. (The IP Address allocated by the ISP, not the address on your LAN.) Note that because all Servers have the same IP Address, the appropriate client software (e.g. Browser, FTP client, Mail Client) must be used so that Internet users will be connected to the correct server.
  5. Ensure that the connection to the Internet is established. Internet users cannot open a connection.

Defining Virtual Servers

If the type of Server you wish to use is not listed, you can define it by clicking the Add button. You will see a screen like the example below.

Figure 20: Virtual Server Setup

Data - Virtual Servers

Enable
Use this to Enable or Disable support for this Server, as required.
Protocol
Select the protocol (TCP or UDP) used by the Server.
Name
Names are case insensitive (case is ignored).
IP Address
The IP Address of the PC on your LAN which is running the Server software.
Internal Port Number
Enter the port number used by the Server to connect to clients.
External Port Number
The port number used by clients when connecting to the Server. This is normally the same as the Internal Port Number.
If it is different, this device will perform a "mapping" or "translation" function, allowing you to configure the server to use one port address, while clients use a different port address

VPN (Virtual Private Networking) Servers

The ISDN Internet Router supports VPN, using PPTP (Peer-to-peer Tunneling Protocol).

Once this is done, the ISDN Internet Router is transparent. Simply configure and use your VPN software as described in the software documentation.

Exposed Computer

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 "Exposed Computer" and other Internet users or Servers.

This allows connection to special-purpose servers which require proprietary client software, or 2-way user connections such as Video-conferencing, which requires both users to run special software.

Operation

Figure 21: Exposed Computer



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