Find Static IP in C#

[Talk2Tom11]

I am writing a client/server application. In the server part it looks up for an IP address. The only problem is that it looks for the local IP. Which with a local IP, if a user wants to access the server froma client that is not within that network then it will not be able to log in. I have inserted the code below that I used to find the IP for the server, but for the local IP. If anyone knows how to find the Static IP please post. :)

 

 

// Determine the IPAddress of this machine
		IPAddress [] aryLocalAddr = null;
		String strHostName = "";
		try
		{
			// NOTE: DNS lookups are nice and all but quite time consuming.
			strHostName = Dns.GetHostName();
			IPHostEntry ipEntry = Dns.GetHostByName( strHostName );
			aryLocalAddr = ipEntry.AddressList;
		}
		catch( Exception ex )
		{
			Console.WriteLine ("Error trying to get local address {0} ", ex.Message );
		}

		// Verify we got an IP address. Tell the user if we did
		if( aryLocalAddr == null || aryLocalAddr.Length < 1 )
		{
			Console.WriteLine( "Unable to get local address" );
			return;
		}
		Console.WriteLine( "Listening on : [{0}] {1}:{2}", strHostName, aryLocalAddr[0], nPortListen );
		
		// Create the listener socket in this machines IP address
		Socket listener = new Socket( AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp );
		listener.Bind( new IPEndPoint( aryLocalAddr[0], 399 ) );
		//listener.Bind( new IPEndPoint( IPAddress.Loopback, 399 ) );	// For use with localhost 127.0.0.1
		listener.Listen( 10 );

[Derek Stone]

Assuming that by "local IP" you mean the IP address assigned to the computer by NAT or the one specified manually in the TCP/IP configuration dialog, and by "static IP" you mean the IP address of the gateway (router), you can't retrieve the "static IP" without issuing a network request, nor should you have to. Most routers allow for port forwarding, which will easily deal with issues such as this.

[Talk2Tom11]

umm... ok. I kind of understand what you are saying. I am not all to familiar with this stuff, but how would I get my server to look for that other IP and then listen on it

[twistedm1nd]

As long as the client knows the static IP of the server he can connect to it on port 399 ( in yer case) your existing server code should work just fine.

 

You can access http://www.whatsmyip.org from a browser on the machine thats gonna host the server to get the static IP of the machine [ im sure there are easier methods butthis is the one that i'm aware of ]

 

the above code snipit just ensures that the machine running has an IP, and then uses that address to bind a socket and listen for requests.

 

 

ther real work happens after you call accept

ie

Socket requestHandler = listener.Accept();

[Talk2Tom11]

Thank you very much. I was wondering where to place that piece of code in my server.

 

Socket requestHandler = listener.Accept();