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MGP Pro Series • Reference Information 107

Subnet Mask

The subnet mask is another 32-bit binary number that is used to “mask” certain bits of the

IP address. This provides a method of extending the number of network options for a given

IP address. It works by allowing part of the host identifier to be used as a subnet identifier.

It is important that you set the correct value for the subnet mask. The basic values depend

on the class of IP address being used.

Class Name Subnet Mask

Class A 255.0.0.0

Class B 255.255.0.0

Class C 255.255.255.0

See Subnetting, a Primer on page 110 for more information.

Pinging for the IP Address

To access the MGP Pro via the Ethernet port, you need the processor IP address. If the

address has been changed to an address comprised of words and characters, the actual

numeric IP address can be determined using the Ping utility. If the address has not been

changed, the factory-specified default is 192.168.254.254.

Ping can also be used to test the Ethernet link to the MGP Pro

Ping to determine IP address of the device

The Ping utility is available at the command prompt. Ping tests the Ethernet interface

between the computer and the MGP Pro. Ping can also be used to determine the actual

numeric IP address from an alias and to determine the web address.

Ping the MGP Pro as follows:

1. For Windows XP or earlier: From the Windows Start menu, select Run... . The

Run window opens.

For Windows 7 or later: Click Start on the Windows taskbar.

2. For Windows XP or earlier: In the Open text field, enter command.

For Windows 7 or later: In the Search programs and files field, enter command.

3. Click OK or press <Enter>. A command window opens.

4. At the command prompt, enter ping IP address, where the IP address is the numeric

address or an alias

. The computer returns a display similar to figure 47.

The line Pinging ... reports the actual numeric IP address, regardless of whether you

entered the actual numeric IP address or an alias name.

C:\>ping 192.168.254.254

Pinging 192.168.254.254 with 32 bytes of data:

Reply from 192.168.254.254: bytes=32 time<10ms TTL=128

Ping statistics for 192.168.254.254:

Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

Minimum = 0ms, Maximum = 0ms, Average = 0ms

Figure 46. Ping Command and Response Example