Question : Configuring a SonicWALL Pro 3060 behind a Netopia R7200-T Router

The current situation is that we have a SDSL using a Netopia R7200 Router for Internet access and VPN for remote sales users to login to use network resources.  

We just purchased a SonicWall Pro 3060 Firewall and plan to implement this into the network infrastructure.  Our current network is using a 10.0.0.0/24 subnet (e.g) and router is currently set with 10.0.0.1 and it has one routable IP address.  

I'm under the impression that the SonicWall's LAN protected subnet has to be different from the router(e.g) 10.0.1.0/24.  Instead of changing the IP addresses of the whole DHCP scope, server IPs, lmhosts, etc.  I want to change the subnet of the router so we can leave everything else the same, and have less modifications to make.

So if I set Netopia Router to 10.0.1.1 and give the SonicWall WAN IP of 10.0.1.2, and LAN IP of 10.0.0.1, have all LAN machines running 10.0.0.X with 10.0.0.1 as gateway.  Any of you guys have any idea how I can get the VPN to work on the SonicWall?  Do I have to make some special settings on the Netopia router in order to make this work because we will have to disable the VPN functions on the router.
Originally sales people would VPN PPTP to the router's public address and connect fine, once we remove those profiles, how does the router know to route/forward everything to the SonicWall?  Do I disable NAT on the router as well?  SonicWall tech support is just as bad as Dell, I cant understand a thing they're saying. =(

Thanks in advance.

Answer : Configuring a SonicWALL Pro 3060 behind a Netopia R7200-T Router

Your IP addressing scheme sounds feasible and should work. I'm not familiar with the Netopia device but you'd need to forward the ports used by your VPN device (the SonicWall) to the SonicWall's IP address. You'll also need to switch on NAT traversal on the SonicWall for the VPN to work with a NAT device in front of it.

I have set up a SonicWall in this configuration before but don't have my notes to hand. I'll check back again when I have time and my notes to hand. Hopefully some other experts will be able to help you out more in the meantime.

There are some good SonicWall technical documents here: http://www.sonicwall.com/services/documentation.html.

Hope that helps.