Extron Electronics VN-COMMANDER - Manual (Page 131)

I456GB issue 8 121
VN-COMMANDER User Guide Appendix A: IP Addressing
The following is an example of an invalid Class C
addressing scheme:
Device IP Address
VN-COMMANDER
Computer 208.132.180.41
VN Processor 1 192.157.180.42
VN Processor 2 209.100.123.43
NOTE: These are invalid because the network identifier for each
address is not the same, even though each IP Address is unique.
You can perform a simple test from your computer to
check that a device at a particular address is responding
correctly. See ‘Testing the Ethernet Link’ on page 12.
Sublet 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’.
Any further explanation of this facility is not relevant to
VN-COMMANDER.
However, 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