I am running PA-4050's in an HA oair with s/w version 4.0.7. I have a "guest-wi-fi" zone and Untrust Zone. I currently have an outbound NAT rule for the Guest wifi pool (10.250.98.0/24) to the Untrust Zone using the source address of the wifi pool (10.250.98.0/24) going to destination "any" using dynamic IP and Port translation to 126.96.36.199 (external address used for our guest wifi users). I believe I need the reverse NAT in order to properly route traffic back to Guest wifi users. My question is would the inbound NAT work with this configuration:
Source zone: Untrust to destination Zone Untrust, source address "any" destination address 188.8.131.52, service "any" source translation "none" destination translation "Guest LAN - 10.250.98.0/24). Or do I need the source translation as the 10.250.98.0/24?
If you are not hosting a server on the guest wifi network, you won't need an inbound NAT rule. In other words, if guest-wifi users only need to be able to connect out from this network, you only need source NAT. For the packets coming back from servers on the internet that match a session initiated by a guest in the guest-wifi network, the firewall will automatically perform the reverse translation.
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