ip nat extendable

rnolden · ‎09-29-2003

what is the diffence between:

- ip nat inside source static local-ip global-ip

and

- ip nat inside source static local-ip global-ip extendable

are there any URLs on CCO for explanation ?

what means the hint:

Extendable = (Optional) Extends the transmission.

preddyi · ‎09-30-2003

Hi,

1.In the first case (Simple Translation)

"ip nat inside source static local-ip global-ip "

simply the global-ip is mapped to local-ip (one to one mapping)

2.In the second case (Extendable Translation)

globl-ip,port pair (socket)is maped to local-ip and port pair.

Here the advantage is with single Global IP,

Multiple services in the local network on multiple machines can be accessed. (practical example for load sharing)

For example traffic on FTP service (port 21) can forwarded to Local IP1

othere service HTTP (port 80) can be forwarded to Local IP2 and so on...

Pls refer to the followint URL for more details