RE: Nat issue.

From: Paul Cocker (paul.cocker@inbox.com)
Date: Fri Apr 20 2007 - 06:48:30 ART


Paul,

I believe the NAT translation occurs before the routing, so you are okay.

http://www.cisco.com/warp/public/556/5.html

Regards,
Paul

-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Paul
Casey
Sent: 20 April 2007 07:05
To: Cisco certification; ccielab@groupstudy.com
Subject: Nat issue.

Hi I am trying to do the following.

1. Sent traffic through a router,from an etherenet interface to a serial
interface (natting on the serial interface on the way out) NAT the source
address to a virtual ip address that is actually not attached to the router,
& from there the router sends the traffic on its ways to its destination
which is a routable address.

When the return traffic comes back to this router (other router in the
network have static routes pointing back to this router to get to the
virtual address) I want the router to NAT the virtual destination address
(on the way through the router on the outside serial interface back to the
orginal source ) which is on the ethernet side. This is the same serial
interface which natted the source traffic on the way out.

Its not the natting on the way out I am concerned about. It the natting on
the serial interface on the way back in. I am concerned the router will drop
the packet as it doesnt have the destination address in its routing table
until after it nats the destination address.

Can this be done ?

Any help appreciated.
Thanks
Paul



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