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Installation

3.3.5 FIREWALL CONFIGURATION FOR INTERNET ACCESS

As modem/routers differ enormously in their configuration, it is not possible for DSE to give a complete guide

to their use with the module. However it is possible to give a description of the requirements in generic terms.

For details of how to achieve the connection to your modem/router you are referred to the supplier of your

modem/router equipment.

The module makes its data available over Modbus TCP and as such communicates over the Ethernet using a

Port configured via the DSE Configuration Suite software.

You must configure your modem/router to allow inbound traffic on this port. For more information you are

referred to your WAN interface device (modem/router) manufacturer.

It is also important to note that if the port assigned (setting from software “Modbus Port Number”) is already in

use on the LAN, the module cannot be used and another port must be used.

Outgoing Firewall rule

As the module makes its user interface available to standard web browsers, all communication uses the

chosen port. It is usual for a firewall to make the same port outgoing open for communication.

Incoming traffic (virtual server)

Network Address and Port Translation (NAPT) allows a single device, such as the modem/router gateway, to

act as an agent between the Internet (or "public external network") and a local (or "internal private") network.

This means that only a single, unique IP address is required to represent an entire group of computers.

For our application, this means that the WAN IP address of the modem/router is the IP address we need to

access the site from an external (internet) location.

When the requests reach the modem/router, we want this passed to a ‘virtual server’ for handling, in our case

this is the module.

Result : Traffic arriving from the WAN (internet) on port xxx is automatically sent to IP address set within the

configuration software on the LAN for handling.

NOTE:

NOTE:NOTE:

NOTE:-

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