System Description

Chapter 9 - Appendix
MCIL -WIPLL-SDN_R1_40 Marconi Communications Ltd. 9-7 of 9-8
The RFC 1918 addresses that can be used are:
•
Class A: 10.x.x.x
•
Class B range: 172.16.0.0 -172.31.0.0
•
Class C range: 192.168.1.x-192.168.254.x
The advantages of using these numbers on the inside of the firewall are twofold:
•
hout fear of running out of
addresses
•
addresses.
For example, if arbitrarily using the Class C range of 192.31.7.0 for network
addresses on the inside of your firewall, you will find that your computers will never
be able to connect to another machine having a legitimate IP address such as
192.31.7.31, because the hosts will forever be trying to reach a machine on the
inside of your firewall that does not exist.