How to configure NAT

[pctechnician]

I have a 2621 w/ two Fast Ethernet ports. one FA will be internal and the other FA will be external to the internet.

I want to be able to allow NAT on the external FA.

How would i go about doing this

A+,Network+,MCP

 

[luisbeu]

My friend,


Please, see the link below:

http://www.cisco.com/en/US/tech/tk648/tk361/tk438/tech_protocol_home.html

luisbeu
Brazil

 

[rcasta]

Do you have an assigned ip address pool? If not you could use PAT (Port Address Translation) by using your FA external address as follows

!define ip network to be nat'd
access-list 1 permit a.b.c.d wc.wc.wc.wc
ip nat inside source list 1 interface Fasteth0/1 overload

interface Fastethernet0/0
description Internal
ip nat inside

interface Fastethernet0/1
description External
ip nat outside

!done

hope it helps,

 

[pctechnician]

actually one of the HQ sites is a funnel to the internet. I have 4 other sites that will access the internet from the HQ site

ex:
INTERNET
|
|
BRANCH OFFICE------------HQ SITE----------BRANCH OFFICE
/ \
/ / BRANCH OFFICE BRANCH OFFICE

A+,Network+,MCP

 

[rcasta]

Then add corresponding networks into access list 1. It may still work that way.

cheers,

 

[rcasta]

Do you have an ISP-assigned Internet pool of addressess?
How would you like to set NAT up?

cheers,

 

[pctechnician]

No, just one public ISP address, 207.215.x.x

I would just like to set it up so that anyone accessing the net from any of the internal addresses, would get
NAT-ed with that public address of 207.215.x.x



A+,Network+,MCP

 

[vacevedo]

So, that is PAT.

You have one public address, which is the one all your private (internal) addresses are going to use to be routed into the Internet

If this is the scenario, you can use the configuration given in one of the first follow-ups to your post.

.va