RE: NAT problem

From: Joe A (groupstudy@comcast.net)
Date: Wed Nov 13 2002 - 11:29:51 GMT-3

Alex,

Since you have only one outside address, and since your servers run the
same app (http/80) with different content, I don't think you can use NAT
to solve your problem.

Here's a suggestion:

1. NAT the outside address to one of the 5 hosts.
2. Have all 5 hostnames resolve to the outside address in DNS.
3. At the host that receives the inbound traffic, have it look at the
hostname in the URL host header and redirect to a directory on itself or
one of the other 4 servers based on the name the user entered in the
URL.

Let me know if this works, because it sounds like it would, but I
haven't actually done it.

Joe

-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Paul Browning
Sent: Wednesday, November 13, 2002 8:26 AM
To: 'Alex Hsieh'; ccielab@groupstudy.com
Subject: RE: NAT problem

Hi Alex,

do you want to overload the outside interface and have static port
translations for the servers (web, email etc)?

http://www.cisco.com/warp/public/794/827spat.html

For load balancing you will need to use route maps but not sure if this
will fit your scenario.

http://www.cisco.com/warp/public/105/nat_routemap.html

Hope it helps

Kind Regards

Paul

-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Alex Hsieh
Sent: 13 November 2002 11:06
To: ccielab@groupstudy.com
Subject: NAT problem

hi group:

            Please help me on this.Currently we have 5 different web
servers connected to

a router with only one valid outside address.I know we could do NAT load
balancing

if servers are of same kind.But how about different servers?Is NAT still
possible?

Thanks a lot.

Alex

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