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Mutiple SSL mappings for a single firewall

I am a newbie that needs some help with a problem that I having with a Cisco 871W and multiple HTTPS locations.

Here is the current issue, I have a DSL business router that has 5 legal IPs and the Cisco 871W assigned a single IP from the group of IPs. There is a SSL VPN at port 4443 with the Cisco self-created certificate SSL using the public IP address of the 871W. There is also a Go-Daddy SSL certificate for the same address using the standard port for secure webmail. Of course this works OK as long as you ignore the error to the SSL VPN certificate errors since it is used encrypt the communication. But now the client wants to get an additional SSL certificate from Go-Daddy for the SSL VPN connection so that they can both encrypt and certify the connection. I know that you cannot have a mutiple SSL certificates for the same address, so I was wondering if the following is possible.

1. Keep the original IP address for the secure webmail

2. Assign an additional legal IP address to the Cisco 871W for SSL VPN using port 443.

3. Modify the Cisco 871W to use a Go-Daddy SSL certificate

Any help or suggestions are greatly appreciated.

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