In order to ensure that only one firewall is inspecting traffic and handling address translations on your network, your office firewall must receive a Public IP address on its WAN interface. 

This functionality may require the assistance of your internet service provider (ISP).

Identifying a private (non-public IP address) is fairly easy.  If your WAN has an IP address in one of the following IP blocks, it is not a Public address, and you should contact your ISP to help "Bridge" your Modem/Gateway device, allowing a Public IP address to be assigned to your firewall/router.





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