One private IP NAT to multiple public IPs?

Unanswered Question
Jun 30th, 2007
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I have a requirement to setup a network so that an internal server communicates with outside world through different WAN networks. I have three separate WAN connections terminated on a single Cisco 6500. The internal network also connects to the same switch.


External VLANs: Ingress, Egress and Management

Internal VLAN: Internal

Requirements:

1. Management traffic can only talk to the internal server(s) via Management WAN;

2. Application traffic can only talk to the internal server(s) via Ingress WAN;

3. Outbound traffic originated from internal servers has to go through Egress WAN;

4. Internal servers use private IP addresses


For example, I have:

Servers on Internal VLAN:

10.0.0.2

10.0.0.3

10.0.0.4


The mangement traffic (i.e. SNMP, ssh) uses the following public IPs to reach each server:

5.5.5.2

5.5.5.3

5.5.5.4


The application traffic (i.e. www, ftp) uses the following public IPs to reach each server:

6.6.6.2

6.6.6.3

6.6.6.4


The traffic initiated from the servers uses the following public IPs to access the Internet:

7.7.7.2

7.7.7.3

7.7.7.4


Given the requirements above, how do I design/configure my switch to achieve the goal? I've done some searches on the forum with no luck. Please kindly advise. Any hint would be appreciated!


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