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androidtcprouternat

Android: Is it possible to connect to a server without configuring router's NAT?

I'm trying to find a way to establish a TCP connection (socket) between an Android device and a server without having to setup server's router NAT.

ANDROID DEVICE -> INTERNET -> ROUTER (with fixed external ip address) -> SERVER (with fixed LAN ip address)

Something like: "connect to 200.111.222.333 (with local address 192.168.1.1) on port 5000".

Solution

  • You would have to use TURN or STUN or some other intermediate connectivity solution, but in general it isn't possible to declaratively specify an internal target behind a NAT device for a generic TCP connection on any platform (not just Android).