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DL-WINDOWS™ for Trilogy Networx™ V4.0 USER'S GUIDE 7

START HERE

This section will help you define the steps required to suit the

specific needs of your installation. Let's start with the big ques-

tions first, because the installation steps that follow depend on

your answers. Note: The underlined

words are defined in the

Terminology section on page 9.

PRELIMINARY QUESTIONS

You may not have answers to the following questions now,

but understand that they are intended to encourage thought

and help evaluate your needs.

 Are you planning to use a large Corporate Network or

a smaller network provided by single router?

Smaller networks permit the dynamic assignment of IP

addresses by DHCP; larger networks may require static

(fixed) IP addresses be reserved by your network admin-

istrator.

 Will you use "Emergency Commands"?

Three Emergency Commands are available in your wire-

less system: "Global Lock Down" locks all doors in the

system; "Global Passage" unlocks all doors in the sys-

tem; "Return to normal" exits these Emergency Com-

mands. Emergency Commands will NOT work if you use

DHCP (static IP addresses are required). For more infor-

mation regarding Emergency Commands, we strongly

recommend you familiarize yourself with this topic on

pages 49-53, and also with the Tools menu and its ability

to send the IP Table to selected (or all) Gateways on page

37.

 Will your Gateways need to communicate across mul-

tiple Subnets?

To improve security and processing performance, network

administrators often divide their corporate Intranets into

interconnected but separate segments called "subnets".

If the answer to ANY ONE of the above questions is

"yes", we recommend static IP addresses be reserved

for exclusive use by your Gateways. If the answers are

"no" for all of the questions, and you want to use a smaller

network provided by a router, you can assign static IP ad-

dresses yourself using the instructions that came with your

router; if you want to use a corporate network, you must con-

tact your network administrator to have static IP addresses

reserved for your use.

SUBNETS

Use the following information when installing multiple wireless

Networx Gateways within a corporate Intranet that contains

multiple "subnets".

To improve security and processing performance, corporate

Intranets are often divided into interconnected but separate

segments called "subnets". The IP (Internet Protocol) ad-

dress is a unique address of a device (such as a computer or

a Gateway) connected to a TCP/IP corporate Intranet.

DL-Windows can only Discover

Gateways when the Gate-

ways are connected to the same subnet to which DL-

Windows is also connected.

IP addresses are written as four groups of numbers sepa-

rated by periods; these groups are called "octets". IP ad-

dresses can be permanent ("static") or dynamically assigned

(by DHCP) when a device, such as a Gateway, is powered.

Class B Subnets

Some corporate Intranets contain multiple "Class B" subnets;

the "Class B" refers to the octet that does not change, if nam-

ing each octet from left to right. An example of two "Class B"

subnets where the first two octets of each network IP address

remain the same are:

A B C D

● Subnet 173.16.100.xxx

● Subnet 173.16.200.xxx

In this example, the "A" and "B" octets "173" and "16" are the

same within the network. (Note: The "xxx" is a way of show-

ing a variable number).

As shown in the image above, if the computer running DL-

Windows is connected to the first subnet (173.16.100.xxx),

and several Gateways are connected to the second subnet

(173.16.200.xxx), DL-Windows will ONLY be able to commu-

nicate with the Gateways on the second subnet when:

● ALL Gateways use only static IP addresses, and

● The network administrator allows for open addressing

between the two subnets in the network

The network administrator may decide to use routing tables

or may specify blocks of addresses through which the two

subnets can freely communicate in both directions. Regard-

less of the method selected, your network administrator must

determine the range of network addresses to assign to the

Gateways and to the DL-Windows computer. As shown be-

low, three address fields must be obtained from your network

administrator: IP Address, Subnet Mask, and Default

Gate-

way.

Why we recommend using static IP addresses

We recommend using static IP addresses for each Gateway

you install because they have the following advantages:

● DL-Windows software performs more smoothly because

the software does not have to waste time re-locating

Gateways that have had their IP addresses changed by

DHCP;

● Static IP addresses allow operation across subnets in

Subnet

173.16.100.xxx

Subnet

173.16.200.xxx

GATEWAYS ON DIFFERENT SUBNETS WITHIN A NETWORK

PC Running

DL-Windows

Software

GATEWAY

ROUTER or

SWITCH or SERVER

GATEWAY

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