Java program to ping remote machine using IP address..?

[prabhurangan]

Dear Members,

I have to ping a remote machine, which is used as a server for my support project. If the server is down it takes more time to load the application. So i have to redirect to error page 'Support site is down for maintanence'. How to know the status of remote machine, whether it is up or down.


Please let me know the solutions for this issue.

Regards,
Prabhu.

[Steve11235]

Look at InetAddress.isReachable(). This performs the ping function and returns true if the ping was successful.

[Eranga]

It's reduces number of code lines, trying to use a process.

[sourabh]

Hi I wants to ping a remote server. As i am behind the proxy i am not able to ping it .Is there any way to bind proxy with InetAddress. This is always giving False result.

My code snippet is:

InetAddress address = InetAddress.getByName("www.google.com");
boolean chkConnection = address.isReachable(1000);

Please help

Regards
Sourabh

[Eranga]

Behind what firewall your request is?

[sourabh]

Hi
I am behind a proxy server for Vlan. I can't access the internet directly. I access via proxy setting.

[sourabh]

Please help me in how to bind proxy with inetAddress.

[Eranga]

Actually you cannot do this through a proxy server. I'll explain why I ask that question from you.

To ping to the outside host from your LAN, it's required to ICMP protocol request complete. Proxies are not allowed that. If you are using MS Proxy then it's allowed only passe UDP and TCP. We can control those things within the proxy server as you wish at the time of build it.

[Eranga]

What I can suggest you is to add the request object to the trusted list.

[Biboo]

Hi Everybody, Im trying to use the InetAddress.isReachable(). but its not known in my JDK, it is showing me an error , isReachable() methode is not recognized.
Please tell me how to fix this, i really need the solution

[Eranga]

Did you instantiate the relevant address?

[Eranga]

It's better, if you could show something over here that what you've done. So it's easy to comment on you.

[Biboo]

hi, thanks for replying me.. here is the example code:

import java.io.IOException;
import java.net.InetAddress;

public class IPTest {
 
    public static void main(String[] args) {
         try {
            InetAddress adr = InetAddress.getByName("10.252.11.112");
            System.out.println("Host is reachable: "+adr.isReachable(3000));
        }catch (IOException e) {
            e.printStackTrace();
        }         
    }
}

the isReachable() methode not recognized in my code , i have tried many examples.. still the same problem.

[Eranga]

Hi Biboo, please use code tags next time when you are posting code segments. Sometimes, not like in a small code segment, it's really hard to read unformated codes. It's a good practice, use them. :)

If you don't know how to do it, check my forum signature. You can find a relevant link for that.

[Eranga]

Regarding your question, what you mean by method not recognized in your code? Can you elaborate it.

[Biboo]

hi Eranga,

when i generate the code it says that isReachable() is not reconized , it is like not existing in the library.
you got me now??

[Eranga]

Did you import required packages?

import java.net.InetAddress;

[Biboo]

Of course i did :P
i just cant understand...

[Eranga]

Can you post the complete error message that comes with when you compile the code.

[rajatkumarv]

hey every one there is only one mistake that the agr you give in getByName() is add not name

try this:-

import java.io.*;
import java.net.*;

public class NetScanner2
{
byte a[] = {10,17,1,(byte)136};

public NetScanner2()
{
try
{
System.out.println(InetAddress.getByAddress(a).isR eachable(10000));
}catch(Exception e)
{}
}

public static void main(String []args)
{
new NetScanner2();

}

}