or do some tracing using tcpdump. There you could see how traffic is arriving on your web server. As an alternative, connect with your mobile from external network and try to reach a demo site 
This should proof the access working.
or do some tracing using tcpdump. There you could see how traffic is arriving on your web server. As an alternative, connect with your mobile from external network and try to reach a demo site This should proof the access working.