Chating between two client.

Hi All,

Two user can chat between each other in client server architecture.

Architecture look like this:

Client1<-->gateway<-->SEVER<-->gateway<-->Client2

1: Client1 can ping to server ip, then login successfull.

2: Client2 also can ping to server ip, then login successfull.

3: but Client1 & Client2 is not ping each other

4: then client1 & client2 can chat?????

Open fire/sparweb how to work, it's chating direct Ethernet to Ethernet.

Or

Client1 send the request to server then server send the response to Client2 ?

Please help me

Thanks