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    <p>One method of doing this is via UDP broadcast packets. See <a href="http://beej.us/guide/bgnet/output/html/multipage/advanced.html#broadcast" rel="nofollow">beej's guide</a> if you're using BSD sockets. And <a href="http://msdn.microsoft.com/en-us/library/tst0kwb1.aspx" rel="nofollow">here</a> is Microsoft's version of the same.</p> <p>Assuming all the clients of the application are on the same side of a router then a broadcast address of <code>255.255.255.255</code> (or <code>ff02::1</code> for IPv6) should be more than adequate. </p> <p>Multicast is another option, but if this is a LAN-only thing I don't think that's necessary.</p> <h2>Suggestion</h2> <p>Pick a UDP port number (say for the sake of an example we pick 1667). The client should listen to UDP messages on <code>255.255.255.255:1667</code> (or whatever the equivalent is. e.g.: <code>IPEndPoint(IPAddress.Any, 1667)</code>). The server should broadcast messages on the same address.</p> <h2>Format Suggestion</h2> <p>UDP Packet: First four bytes as a magic number, next four bytes an IPv4 address (and you might want to add other things like a server name).</p> <p>The magic number is just in case there is a collision with another application using the same port. Check both the length of the packet and the magic number.</p> <p>Server would broadcast the packet at something like 30 second time intervals. (Alternatively you could have the server send a response only when a client sends a request via broadcast.)</p>
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    1. COThank you, that helped.
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      1. USDavid Sergey
    2. CORather than having the server broadcast its info at frequent intervals, which just wastes bandwidth, a commonly used option is to have the client send its own broadcast instead, asking for any servers to identify themselves. Any server receiving that broadcast can then send a reply back containing its current info. The client can gather that info and pick which server (if multiple) to connect to.
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      1. USRemy Lebeau
 

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