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This translates to the following usable Public IP addresses: 200.2.2.1 - 200.2.2.6.Īs one would expect, we need to sacrifice two IP addresses: one for the router's serial interface and one for the ISP's router. The router is connected to the ISP via its serial interface. The diagram below represents our example network, which consists of a number of internal clients trying to access the Internet via our router. Lastly, if you're only interested in Dynamic NAT, you can simply follow this link and read up on our theoretical example covered on Firewall.cx. If you would like to read more on the NAT theory, be sure to read our popular NAT articles, which explain in great depth the NAT functions and applications in today's networks.
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The following steps explain basic Cisco router Dynamic NAT configuration. Once the internal host stops sending and receiving packets from the Internet, the router's NAT timeout will clear the Dynamic NAT entry from its NAT table, making the real IP address available to the next internal host. Dynamic NAT enables multiple internal hosts access to the Internet by assigning each host a unique real (Public) IP address for the duration of the session. NAT ( Network Address Translation) is a method that allows the translation (modification) of IP addresses while packets/datagrams are traversing the network.