Firewall Subnet
How does a network subnet be assigned to firewalled subnets ?
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Firewalled Subnets are literally every subnet behind the firewall. By default that would typically be LAN, DMZ and WLAN if you have a Wireless device. When you add more VLANs/subnets such as LAN2, WLAN12, etc. they will all be auto-added to the Address Object Firewalled Subnets. Do not attempt to modify Firewalled Subnets nor any default Address or Service Object. If they don't exist or you are looking for something that is not found in the Default Objects just create new ones.
Click on the radio dot next to Custom Policies within the NAT Policy page...this will show you what you've created. Don't worry about default NAT policies these are auto-created by SonicWALL to handle traffic accordingly. There is no need to change them.
The best most comprehensive way to open ports etc. is via the Wizards link > Public Wizard. This will guide you and setup the needed Access Rules, NAT Policies, Address & Service Objects for what you are trying to do. If you find the Wizard to limiting just use it regardless to establish the baseline and then modify what you need to after the fact.
Make sense?