CCNA learning NAT

NAT: Network Address Translate

Translate the ip address of intranet into that of the internet

Private Address:

A: 10.0.0.0

B: 172.16.0.0 - 172.31.255.255

C: 192.168.0.0 - 192.168.

NAT table

Inside Local IP address: IP address of intranet

Inside Global IP address: IP address of internet

NAT Function

1. Translate the IP address of intranet

2. Use internet IP address for more intranet IP address(divided by ports)

Example

NAT Type

1. static NAT: manually map between Internet IP address and Intranet IP address. One for one

2. pooled NAT: dynamic map between Internet IP address and Intranet IP address. One for one

3. port NAT(PAT): map between Internet IP address and Intranet IP address. One for more

Static NAT config

Other IP address of Internet only can ping the outside IP address

Pooled NAT (dynamic NAT) config

PAT config

Verify NAT

Troubleshooting NAT

* indicate the reserve path

Clearing NAT Translation Entries