When you are using the Firewalla VPN Server (and also site to site VPN), it is required that you have a public addressable IP address. Due to the shortage of IPv4 addresses, some service providers may give you a private IP address, or you may be under double NAT. (router within another router)
What is a private IP address? https://en.wikipedia.org/wiki/Private_network
To detect if you have a private IP address, please do this.
If you have a Blue / Blue Plus / Red:
1. log in to your router and look at the WAN or Internet Address. Record this as Address1.
If you have a Gold in router mode
1. Tap on the Network button, tap on WAN and record the IPv4 address as Address1.
Next visit https://www.google.com/search?q=whats+my+ip&oq=whats+my+ip
Record this address as Address2
If you find Address1 and Address2 are different, then you do not have a Public IP, or you are under double NAT.
What to do next:
1. You will need to investigate and see if you are under double NAT.
2. If your ISP is giving you a none public IP.
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