Question

internet programming

Asked by: tameem_md

i  am developing a chat application . currently i m able to make connction between public to public ip. but i m not bale to connect public to private pls give me the concept and if possible kindly send a sample code. i m developing the application in vc++.

thanks
tameem

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Asked On
2003-08-01 at 02:15:28ID20696669
Tags

chat

,

sample

Topic

Miscellaneous Programming

Participating Experts
3
Points
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Comments
7

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Answers

 

by: pellepPosted on 2003-08-01 at 03:45:21ID: 9047413

If by private you mean the private IP ranges ie 192.168.X.X, 127.X.X.X, 10.X.X.X etc it's not possible. By the design of the IP protocol, these (and some other) address ranges are 'non-routable' which means that they are only valid within the same network.
So
Public->Public = OK
Private->Private = OK
Private->Public = OK, but only over a NAT
Public->Private = Impossible.

If you think about it, since 'private' addresses are not routed, there may exist millions of machines with the IP address '192.168.0.10'. How are you going to know which one to connect to from a Public IP?

 

by: pambooPosted on 2003-08-01 at 03:57:12ID: 9047458

Hi ,
       U should need a server running on any public IP where ur clients send data to server and receives data from server .

Like Forwarder . U have to think of a Chat Server . Handles clients connection + Persistance connection or client polling + clients message chacing + forwarding to other clients etc.,

If the chat server runs on a public IP , any chat clients can connect to the server and send and get data.  

Keep the messaging across client and server as HTTP. Append ur message in the message body of HTTP message . Follow some protocol to communicate with server and client .

The above will give u atleast  an abstarct to achive ur need.

Okay . see u . Bye

Regards,
naga

 

by: pambooPosted on 2003-08-01 at 03:59:48ID: 9047462

*Follow some protocol to communicate with server and client even in ur message body apart from the HTTP wrapper . U need http bcos most of the clients will be behind HTTP Proxy .

Regards,
Naga

 

by: UTProphetPosted on 2003-08-01 at 22:30:04ID: 9053098

A better way is to have a server on any machine with a routable IP.  Both clients connect to this server, and since its address is routable, any client can connect regardless of its situation.  Now that both clients are connected to the server, you want to chat.  The initiating party (the one that wants to start the chat session) tells the server he wants to start a chat with so and so client.  Since the server already has a connection established with the other client, it can send a message to the other client regardless of its IP, whether it be routable or nonroutable.  The client then sends a message back accepting the invitation, and both clients then communicate through the server.

This is the way chats like AOL and IRC work.  None of the clients connect directly to each other in normal chat.  Of course they have extra features (AIM's Direct Connect feature and IRC's Client to Client Protocol), but these are only guaranteed to work if both clients have routable IP addresses, since its success depends on who is accepting the connection.

I'm guessing you're not worried about it, but just in case you're worried about an overloaded server (which in your case won't matter because one of the clients will be connected to a local server, thus very little overhead), you can implement things like zlib inflate/deflate compression which increases CPU overhead on the clients, but decreases network overhead, which is much more important.  And of course, the CPU overhead won't be anything significant considering the size and frequency of chat messages (i.e. deflating < 1KB [the chat message] will take close to no CPU time at all, and same for inflating it on the receiving end.).  Best part is the server doesn't do any of the deflating/inflating, so requires no extra CPU overhead at all.

Ehh rambling.  pamboo's way works, too, but this is cleaner and gives you some breathing room in case you ever decide to expand your simple 2 person chat to a 3+ user chat, which is ideal.

In any case have fun, this stuff is always interesting.

hope this helps you

20120131-EE-VQP-002

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