Sockets over the 'net.

[theChameleon]

hello, im need to know must i do to "talk" to the server as shown below.


Client (192.168.1.200) --> router (123.123.123.123) --> Internet --> router (210.210.210.210) --> Server (192.168.1.100:9000)

i already know the basics of socket programming; how to set up a server, and how to connect a client. but how do i solve this problem?

thanks.

[jsmith]

Your routers are acting as NATs, which means your client must know the server's public IP address/port number and then the client must connect to that. 192.168.1.100 is the server's private IP address and is unroutable directly.

[theChameleon]

yeah, ok.... but how do i get the router to recognise that the traffic is bound for that particular server?

sry, i dont get all these NAT stuff... and can only get the "theory" stuff but not practical NAT and programming stuff from google.

to make matters worse, people connect through the ISP's proxy.


could i trouble u to explain and pretty much tell me how to connect to the target, or is there a good webby that u know of?

thanks.

[Zhuge]

As far as I know, you cannot tell the router which computer behind it you want to connect to. The routers I've seen (not very many) usually have a system called "port forwarding" that sends all traffic on a particular port on the router to the same port on a particular computer.

[jsmith]

Unfortunately I don't know how you will get the IP/port you need. The router is assigning 192.168.1.100:9000 a publicly routable IP address and port number. You need to know what it assigned.

You might be better off posting on some other network-specific forum, as your question is more in the realm of network administration than C++.