Multiple VLANs and multiple WAN addresses on Sonicwall TZ 215

I am looking for some advice on configuring my new Sonicwall TZ215.

We have a network with 3 VLANs. The first two VLANs use the primary WAN as configured on the Sonicwall. I have an extra IP and was wondering about using it as a public facing (but still firewalled) address for VLAN 3. The two WAN IPs are in the same subnet, and are accessible via the same router.

Since I have a physical connection to the router on WAN (X1) can I utilize that? Do I need to use one of the other X interfaces on the Sonicwall configured as WAN? I'm trying to host a few services logically separated from our primary two networks and am unsure how to proceed.

Advice on the logic, rules, and routing would be greatly appreciated.

Thank you!
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If you want to use a second WAN IP you should use another X interface. Configure the new interface as a WAN interface.
Then create routing rules to forward traffic out over this connection for the services you want.
For any incoming services on the new WAN IP just use the wizard and make sure you select the correct WAN IP.

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