SonicWall TZ 105 multiple public IP addresses

I have a Dell SonicWall TZ 105 appliance configured and running in a small office.

The SonicWall is connected to a Comcast Business Gateway Router.

We have 5 static public IP addresses with Comcast.

The internal Address of the Comcast router is

I configured the SonicWall to use as it's WAN address.
The internal address of the SonicWall is

I am passing the following ports through from the Comcast Router to the SonicWall ( -

443 - VPN - Used by the SonicWall for VPN services.
21 - FTP - Forwarded by the SonicWall to an internal ftp server.
80 - HTTP - Forwarded by the SonicWall to an internal web server.

All of this is working fine, but now I wish to use a 2nd public IP address and pass it through.
On the Comcast router I added a 1 to 1 NAT that passes one of the available public IPs to

Now I assume I have to create a Virtual Interface on the SonicWall that connects to ?
And then I somehow route the proper ports to the internal server that is at ?

Am I on the right track?  
Any suggestions on how to proceed would be greatly appreciated.
Or can anyone recommend documentation that helps explain what I am trying to do?

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nappy_dConnect With a Mentor Commented:
Hi here is a tech article from sonicwall describing the configuration you seek. It shows how to brush the wan into passthrough mode for all of your public ip addresses.
Aaron TomoskyTechnology ConsultantCommented:
Agreed, don't do this double nat setup, move to pass through. That will give the sonicwall all your up addresses and you can do whatever you want with them.
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