
412 Chapter 10 • Requirements For Network Address Translation in Remote Access Networks
other hosts. If there were no timeouts, it is easy to see how quickly router
resources would be depleted.
NOTE
In the above discussion, the NAT router is being used to translate
addresses between the inside and the outside. However, NAT can also be
used internally to a company’s own organization; in fact, a NAT router
can be used between any two routers where address translation is
required. This also implies that the IP subnets being translated can
belong to any address space and may or may not be registered.
Traffic Types Supported
NAT was first supported in the Cisco ...