NAT type detection from a HTTP request
Hello there
I got two JAVA class : httpServer and httpClient. Running in two different machines. Server is listening to a HTTP port in one machine and on the other hand client is sending its machine IP from other PC to the server. But the client is behind a NAT. Now I can detect in my httpServer class that it is behind a NAT. I check the requesting IP and the IP send inside the packet payload. If they are different, I decide there is a NAT in between. But how can I know from such HTTP request-response what kind of NAT I am behind? This is important to know because with symmetric NAT
(http://en.wikipedia.org/wiki/Network_address_translation) , where the NAT binding also include the outgoing address as well, my application is having problem.
I have solution like STUN/TURN server implementation. But I would like to know the type of NAT my client is behind without any extra deployment such as STUN or TURN server.
Any suggestion to detect type of NAT without any extra deployment and merely from HTTP request-response JAVA APIs?
Mohammed Jubaer Arif.
