Cisco Systems 2.5 Network Address Translation

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Cisco Router and Security Device Manager 2.5 User’s Guide
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Network Address Translation
Network Address Translation (NAT) is a robust form of address translation that
extends addressing capabilities by providing both static address translations and
dynamic address translations. NAT allows a host that does not have a valid
registered IP address to communicate with o ther hosts through the Internet. The
hosts may be using private addresses or addresses assigned to another
organization; in either case, NAT allows these addresses that are not
Internet-ready to continue to be used but still allow communication with hosts
across the Internet.
Network Address Translation Wizards
You can use a wizard to guide you in creating a Network Address Translation
(NAT) rule. Choose one of the following wizards:
•Basic NAT
Choose the Basic NAT wizard if you want to connect your network to the
Internet (or the outside), and your network has hosts but no servers. Look at
the sample diagram that appears to the right when you choose Basic NAT. If
your network is made up only of PCs that require access to the Inte rnet,
choose Basic NAT and click the Launch button.
•Advanced NAT
Choose the Advanced NAT wizard if you want to connect your network to the
Internet (or the outside), and your network has hosts and servers, and the
servers must be accessible to outside hosts (hosts on the Internet). Look at the
sample diagram that appears to the right when you choose Advanced NAT.