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<blockquote data-quote="shellback3" data-source="post: 1430941" data-attributes="member: 206072">I'm finishing up a Java package that will provide communications among a few&nbsp; mostly headless computers on a LAN on an aircraft but I have only two LINUX boxes to use for testing.&nbsp; One is the &quot;master&quot; and the other a client.&nbsp; I thought that I would use my personal mac Air as another client to see if the system would work with more than one client but it has a point of failure.&nbsp; When either the LINUX master attempts to get the OS-X client name (Lion or Mountain Lion) or the client attempts to get the name of the master what I get is the respective computer's IP address.&nbsp; I use the computer name as a key in a map.I'm fairly new to Java and quite new to sockets.Here's the code. ipaddress and hostname are strings[CODE]try {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; InetAddress machine = InetAddress.getByName(ipaddress);&nbsp; &nbsp; &nbsp;&nbsp; hostName = machine.getHostName();&nbsp; } catch (UnknownHostException e) {&nbsp; &nbsp; &nbsp; Tell.sendMessage(&quot;getRemoteHostName: host name lookup failed for &quot; + ipaddress);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; } catch (SecurityException e) {&nbsp; &nbsp; &nbsp; Tell.sendMessage(&quot;getRemoteHostName: Security Exception: host name lookup failed for &quot; + ipaddress);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp;&nbsp; [/CODE]My computers are all connected to a router none is a server.&nbsp; I've had&nbsp; no response to this question on a Java forum so thought I would try here.Edit: no exception is thrown or caught.</blockquote>

[QUOTE="shellback3, post: 1430941, member: 206072"] I'm finishing up a Java package that will provide communications among a few mostly headless computers on a LAN on an aircraft but I have only two LINUX boxes to use for testing. One is the "master" and the other a client. I thought that I would use my personal mac Air as another client to see if the system would work with more than one client but it has a point of failure. When either the LINUX master attempts to get the OS-X client name (Lion or Mountain Lion) or the client attempts to get the name of the master what I get is the respective computer's IP address. I use the computer name as a key in a map. I'm fairly new to Java and quite new to sockets. Here's the code. ipaddress and hostname are strings [CODE]try { InetAddress machine = InetAddress.getByName(ipaddress); hostName = machine.getHostName(); } catch (UnknownHostException e) { Tell.sendMessage("getRemoteHostName: host name lookup failed for " + ipaddress); } catch (SecurityException e) { Tell.sendMessage("getRemoteHostName: Security Exception: host name lookup failed for " + ipaddress); } [/CODE] My computers are all connected to a router none is a server. I've had no response to this question on a Java forum so thought I would try here. Edit: no exception is thrown or caught. [/QUOTE]

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