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Offline arun

Junior Newbie





« Posted 2006-06-12 14:36:31 »

how can i obtain the IPAddress of all computers in a network
Online Riven
« League of Dukes »

« JGO Overlord »


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Exp: 16 years


Hand over your head.


« Reply #1 - Posted 2006-06-12 14:44:44 »

There is not really a neat way to do this, as far as I know, but I suppose this would work:

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InetAddress[] all = new InetAddress[256];
for(...)
  all[i] = InetAddress.getByName("x.y.z."+i);

// make this heavily multithreaded!!
boolean[] av = ...;
for(...)
   av[i] = all[i].isReachable(1000);

for(...)
  if(av[i])
   System.out.println("Found: "+all[i]);


I hope you can interpret this pseudocode Kiss

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Offline blahblahblahh

JGO Coder


Medals: 1


http://t-machine.org


« Reply #2 - Posted 2006-06-12 16:26:24 »

You need to write it in native code (not java) - java doesn't give you low-enough level access to the NIC hardware to do this kind of thing efficiently.

However, in 99% of cases you dont want what you asked for, you instead just want to know "which ip addresses are also running a copy of my app?". In which case, just look at the javadocs for the "broadcast" parts of UDP.

NB: the 1% includes people writing viruses, which has long been used as the semi-official excuse for not providing lower-level decenta access. Pisses me off, because you can't write really good, efficient, intelligent P2P cluster code like this. Grumble grumble Smiley.

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Offline Jeff

JGO Coder




Got any cats?


« Reply #3 - Posted 2006-06-12 21:38:23 »

What BBB descriebs is sometimes referred to as "Discovery".

I have an example of broadcast based discovery code  in the networking chapter I wrote for Shawn Kendall's java game programming book.

Got a question about Java and game programming?  Just new to the Java Game Development Community?  Try my FAQ.  Its likely you'll learn something!

http://wiki.java.net/bin/view/Games/JeffFAQ
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