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POHow to send datagram packet through Internet?
 

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  1. POHow to send datagram packet through Internet?
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    <p>I'm trying to make a basic datagram client/server program with Java.</p> <p>I've made the server cling to port 9321 on my local computer.</p> <p>I've made the client on port 9320 on my local computer, then send the data over wireless router network (192.168.1.100) at port 9321 the program works!</p> <p>then i try to send the packet over (via router)internet IP 139.195.12.183(my ip) at port 9321 but it didnt work! there is this exception:</p> <pre><code>java.net.SocketException: Interrupted function call: Datagram send failed </code></pre> <p>i've set the router to forward any request for port 9321 to my computer and then i've set exception for the firewall on my computer on that port</p> <p>this is the source</p> <pre><code>String SERVER = "139.195.12.183"; sendString(SERVER, 9321, "Greetings"); &lt;&lt; private void sendString(String IP, int port, String toSend) { byte[] buf = toSend.getBytes(); DatagramPacket packet = null; try { packet = new DatagramPacket(buf, buf.length, InetAddress.getByName(SERVER), port); ds.send(packet);&lt;&lt; }catch(UnknownHostException e) { System.out.println("unknownhostception"); }catch(IOException e) { System.err.println("ioception "+e.getMessage()); } } </code></pre> <p>i've had another answers from another forum it said:</p> <blockquote> <p>"The way routers work, you can't see your external (WAN) internet address from your internal network (LAN). If that's what you are trying to do, there's nothing wrong, it just won't work.</p> <p>Ian."</p> </blockquote> <p>any explanation?</p>
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    1. USKeenan Gebze
    1. USKeenan Gebze
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    1. COJust to clarify - global network == internet? Your local PC does have a publicly available IP address (the IP you mentioned belongs to a carrier)?
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    2. COah yes i mean internet. the private network is my router.
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      1. USKeenan Gebze
    3. COIf you use IP datagram, always think about its TTL.
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