Shulou(Shulou.com)06/02 Report--

1. The address translation outline is as follows

Second, the working principle of NAT Network Address Translation, network address translation

1. NAT implementation

(1) static conversion

(2) dynamic conversion

(3) Port Multiplexing (PAT)

2. NAT contains four types of addresses

Four types of addresses: internal local address, external local address, internal global address, external global address.

The process of an internal host accessing an external server:

(1) when you go out, check the routing table, and then check the translation address of the NAT table.

(2) when the packet returns, query the NAT table translation first, and then query the routing table.

3. Translation entries of NAT

(1) simple conversion entry: IP

(2) extended conversion entries: IP, port

4. Dynamic and static conversion processes:

Function:

1. Alleviate the depletion of available IP address resources

2. Security, it is impossible to know what the private network address of the personal host is.

III. Advantages and disadvantages of NAT

Advantages:

1. Save the public legal IP address

2. Address overlap

3. Enhance flexibility

4. Security

Disadvantages:

1. Increase in delay

2. Complexity of configuration and maintenance

3. Some applications are not supported, which can be avoided by static NAT mapping.

IV. Configuration commands

1. Static NAT

2. NAT static port mapping

Don't forget to start NAT after configuration.

3. Dynamic NAT

There is no need to manually translate addresses, NAT automatically translates addresses in address fields

4 、 PAT

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