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WindoWall Pro Series • Reference Information 74

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For Telnet command definitions, enter ? at the Telnet prompt.

Exiting Telnet (Quit command)

Exit the Telnet utility by entering quit at the Telnet prompt. If you are connected to the

WindoWall Pro, access the Telnet prompt by entering the Escape sequence (<Ctrl +

]

>).

Subnetting, a Primer

A subnet is a subset of a network — a set of IP devices that have portions of their IP

addresses in common. It is not the purpose of this manual to describe TCP/IP protocol

in detail. However, some understanding of TCP/IP subnetting is necessary in order to

understand the interaction of the WindoWall Pro and the mail server gateway. To understand

subnetting at the level required to install and operate the WindoWall Pro, you must

understand the concepts of a gateway, local and remote devices, IP addresses and octets,

and subnet masks and octets.

Gateways

The WindoWall Pro can communicate with the e-mail server that it uses for e-mail

notification directly (if they are on the same subnet), or the communication can be routed via

a gateway (a computer that provides a link between different subnets).

Local and remote devices

The local and remote devices are defined from the point of view of the function being

described. In this guide, subnetting is an issue when you are using the controlling computer

to set TCP/IP and e-mail values for the WindoWall Pro. When you are setting up the

variables for e-mail notification, the WindoWall Pro is the local device and the e-mail server is

the remote device.

IP addresses and octets

Valid IP addresses consist of four 1-, 2-, or 3-digit numeric sub-fields, called “octets,” which

are separated by dots (periods) (figure 49). Each octet can be numbered from 000 through

255. Leading zeros, up to 3 digits total per octet, are optional. Values of 256 and above are

invalid.

192.168.254.254Typical IP Address:

Octets

Figure 49. IP Address and Octets

Subnet masks and octets

The subnet mask (figure 50) is used to determine whether the local and remote devices are

on the same subnet or different subnets. The subnet mask consists of four numeric octets

separated by dots. Each octet can be numbered from 000 through 255. Leading zeros, up

to 3 digits total per octet, are optional. Each octet typically contains either 255 or 0. The

octets determine whether or not the same octets of two IP addresses will be compared

when determining if two devices are on the same subnet.

255.255.0.0Typical Subnet Mask:

Octets

255 indicates that this octet will be

compared between two IP addresses

0 indicates that this octet will not be

compared between two IP addresses.

Figure 50. Subnet Mask and Octets

1 2 ... 75 76 77 78 79 80 81 82 83 84 85 ... 89 90

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