Creating Loopback Policy
Unfortunately, you can not do a loopback in standard OS. You need to control NAT policy and standard OS does not allow that to happen. If it was enhanced OS, then you would created a NAT policy as shown below. This would direct traffic from the networks behind the Sonicwall to the WAN IP and the back to the server’s private address. If you server has its own public IP, then you would use that object for the Translated Source and Original destination.
An example of a loopback NAT policy.
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