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How do you setup port forwarding but only allowing it from 3 external IP addresses?
Everything I've seen is setup for any but I want to block all access except for 3 external static IPs.
1) Create address object for those 3 external IP's & create address object group and add those external IP's address objects into the group.
2) Create WAN to LAN Firewall access rule and choose the address object group in the source.
3) Create NAT Policy and select the Original Source and choose the created address object group.
Follow below KB for creating the Port Forward Rule in Sonicwall and follow the above steps for allowing the access only from your 3 external IP's.