CCNA Routing and Switching
PAT (Port Address Translation) :
---PAT is used to convert Multiple source ip's into a [ single public ip / pool -multiple public ip's ] using Port Numbers.
In above example or practical we will do PAT on Router R1 which is END Router of LAN Having network of 10.0.0.0 255.0.0.0
R1(config-if)#ip nat inside ---- Inside Interface i.e Our LAN
R1(config-if)#ip nat outside -- Outside Interface i.e WAN
Now configure a access list to match the source traffic :
R1(config)#access-list 1 permit 10.0.0.0 0.255.255.255 - Our LAN Network.
Now we have to do PAT :
R1(config)#ip nat inside source list 1 interface f1/1 overload -- all traffic from LAN get converted into a single ip of interface FA1/1.
To convert it into a pool of ip's we have to creata a pool :
R1(config)#ip nat pool abc 188.8.131.52 184.108.40.206 netmask 255.0.0.0
R1(config)#ip nat inside source list 1 pool abc overload
TO VERIFY :
show ip nat translation --- Entry will be created when traffic will hit the R1 LAN Interface.
Principal Network Architect - Array Networks
Rajan has already explained you people really well.
Here's a video tutorial for Step by Step Configuration guide on How to Configure PAT (Port Address Translation) using Cisco devices:
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