Configuring Multiple ISPs with Backup and NAT

Hi,

I have Multiple ISP Internet links and Multiple Valid IP ranges from each ISP.

For Example let my First Range be 20.10.10.0/24 from ISP-A let my Second Range be 30.10.10.0/24 from ISP-B. Traffic from First range will use ISP-A's Internet Link and others will use ISP-B's link.

I want to configure my CISCO 1841 Router (IOS 12.4) to use Both ISP lines using Route Maps. Also, I want to Enable Redundancy between these two links i.e. If one fails let it use the other.

System-A should be routed after NAT-ing through ISP-A. System-B should be routed after NAT-ing through ISP-B. In case of either link failure, respective system should be routed through the working link.

I am interested in outbound traffic availability only.

Can anybody help ? Thanks in advance.

Rakesh =====

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Rakesh Kumar
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