Subnetting, A Primer - Extron electronics DXP DVI Pro User Manual

Help
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 DXP
switcher, 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 DXP switcher and the mail server gateway. To understand
subnetting at the level required to install and operate the DXP switcher, you must
understand the concepts of a gateway, local and remote devices, IP addresses and octets,
and subnet masks and octets.
Gateways
The DXP switcher 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 in the DXP switcher (see
Control Tab
the matrix switcher 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) (see figure 123). Each octet can be numbered from 000
through 255. Leading zeros, up to three digits total per octet, are optional. Values of 256
and above are invalid.
Typical IP Address:
Figure 123.
Subnet masks and octets
The subnet mask (see figure 124) 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 three 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
are compared when determining if two devices are on the same subnet.
255 indicates that this octet will be
compared between two IP addresses.
Typical Subnet Mask:
Figure 124.
on page 120). When you are setting up the variables for e-mail notification,
192.168.254.254
Octets
IP Address and Octets
0 indicates that this octet will not be
compared between two IP addresses.
255.255.0.0
Octets
Subnet Mask and Octets
DXP DVI Pro and DXP HDMI Series • Reference Information
IP Setup on page 82 and
130