QGE 100 • Reference Information
51
51
4.
At the command prompt, enter
ping
IP
address
. The computer returns a display
similar to the figure below.
The
Pinging
...
line reports the actual numeric IP address, regardless of whether you
entered the address or an alias name.
Figure 34.
Ping Response
Pinging to determine the web IP address
The Ping utility has a modifier,
-a
, that directs the command to return the web address
rather than the numeric IP address.
At the prompt, enter
ping
-a
IP
address
. The display that the computer returns is similar
to the
Ping
response shown in the figure above, except that when you specify the
-a
modifier, the line
Pinging mail...
reports the web IP address instead of the numeric IP
address, regardless of whether you entered the actual numeric IP address or an alias name.
Subnetting, a Primer
A subnet is a
sub
set of a
net
work — a set of IP devices that have portions of their IP
addresses in common. It is not the purpose of this guide to describe TCP/IP protocol
in detail. However, some understanding of TCP/IP subnetting is necessary in order to
understand the interaction of the QGE 100 and the mail server gateway. To understand
subnetting at the level required to install and operate the QGE 100, you must understand
the concepts of a gateway, local and remote devices, IP addresses and octets, and subnet
masks and octets.
Gateways
The QGE 100 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 QGE (see “
Configuring network
settings
” in the “Software Configuration and Control” section). When you are setting
up the variables for e-mail notification, the QGE 100 encoder is the local device and the
e-mail server is the remote device.
