6in4 connectivity - cannot specify the public IP address in case the user is behind 1:1 NAT
When setting up the 6in4 connectivity, there is no option to specify the public IP address in case the public IP address is natted to private IP address. In this case, the configured 6in4 tunnel does not work because of the mismatch of what does the tunnelbroker see and what we send to the tunnelbroker.