Cisco NAT network Address translation configuration

Network address translation (NAT) enables the internal network to be connected to the Internet by translating the private IP address of the internal network into the world's only public IP address, and is widely used in various types of Internet access and various types of networks. NAT: Mitigate IP, hide the private ip,nat of the internal server for routers at the end of the LAN (the one that connects directly to the extranet), and it has nothing to do with the VLAN environment, or the intermediate device.

How NAT is implemented:

1. Static conversion (the private IP of the intranet is converted to a public legal IP, and it is a one-off, unchanging.) Can implement the external network access to the server device in the network) simple translation entries; static NAT port mappings (different service ports of different servers mapped to different ports of the same public IP) extend the translation entry.

2. PAT (change the source IP source port of the out-of-Office packet and port conversion to enable the Intranet PC to use a public IP access extranet) simple conversion entries

Pat Configuration Process:

1. Network environment

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2. Intranet Web Server

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3. Extranet Web server

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4. Switch configuration

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5. Address configuration of the router

(intranet port)

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(External network port)

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6. Intranet PC Access intranet Web

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7. Intranet PC Ping test to access extranet Web and gateway

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8. Router configuration Pat, so that intranet PC can access the extranet

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9. Accessing test effects from intranet PC

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Nat Port Multiplexing Configuration:

1. Look at the extranet web to see that no gateway is configured

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2. Router configuration NAT

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3. Use the extranet PC to access the Web in the intranet (note that this access is the IP address of the NAT router's external network card)

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This configuration is complete!

Cisco NAT network Address translation configuration