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Chapter 9 - Appendix
1QDF10134AAP-SYD-FCC Issue 03
Draft 02
9-5 of 9-6
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:
Internal IP networks can now be “grown” without fear of running out of
addresses
There is no longer a risk of inadvertantly using other networks’ legitimate
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.