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9.0

Cisco IOS - Need to NAT Inbound traffic, as well as Outbound

Asked by ccfcfc in Network Routers, Cisco PIX Firewall

Tags: cisco, nat, ios, inbound

I am trying to get round a problem I am having with Windows load balancing using NAT.

My scenario is this -

I have a group of users that connect to a website behing my Cisco router. I have two web servers which are running under Windows NLB. The users all connect to the web servers using the same IP address as they are NAT'd to the outside interface public IP at their end, which means that NLB sends them to the same web server every time as they are all on one IP address. This obvioulsy means that I am not getting any load balancing on my web servers.

What I would like to do is NAT the incoming traffic to an address pool, so that each of the incoming web sessions from the remote users then has an individual IP address allocated from the pool that I have setup. This would then mean that NLB would spread the connections much more evenly between the web servers.

The question is - do I use the same NAT statements as I would normally use for outgoing NAT ? As long as my NAT statement refers to the address that the users web sessions are coming from, then the NAT pool will still apply even though the traffic is incoming ?

i.e. Will the following work, allowing the remote users coming from 94.7.28.1 to access my web servers on a 10.10.10.x address ?

ip nat pool webuser 10.10.10.1 10.10.10.50 netmask 255.255.255.0
ip nat inside source list 1 pool webuser
access-list 1 permit host 94.7.28.1


TIA


Rob
[+][-]09/30/07 07:12 PM, ID: 19988592Accepted Solution

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About this solution

Zones: Network Routers, Cisco PIX Firewall
Tags: cisco, nat, ios, inbound
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Solution Provided By: tlamonia
Participating Experts: 1
Solution Grade: A
 
[+][-]09/29/07 07:04 PM, ID: 19985941Expert Comment

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[+][-]09/29/07 08:01 PM, ID: 19986037Author Comment

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[+][-]09/29/07 08:14 PM, ID: 19986058Expert Comment

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