How to ping an IP address

Question

I am using this part of code to ping an ip address in java but only pinging localhost is successful and for the other hosts the program says the host is unreachable. I disabled my firewall but still having this problem

public static void main(String[] args) throws UnknownHostException, IOException {     String ipAddress = "127.0.0.1";     InetAddress inet = InetAddress.getByName(ipAddress);      System.out.println("Sending Ping Request to " + ipAddress);     System.out.println(inet.isReachable(5000) ? "Host is reachable" : "Host is NOT reachable");      ipAddress = "173.194.32.38";     inet = InetAddress.getByName(ipAddress);      System.out.println("Sending Ping Request to " + ipAddress);     System.out.println(inet.isReachable(5000) ? "Host is reachable" : "Host is NOT reachable"); } 

The output is:

Sending Ping Request to 127.0.0.1
Host is reachable
Sending Ping Request to 173.194.32.38
Host is NOT reachable

Answer 1

InetAddress.isReachable() according to javadoc:

".. A typical implementation will use ICMP ECHO REQUESTs if the privilege can be obtained, otherwise it will try to establish a TCP connection on port 7 (Echo) of the destination host..".

Option #1 (ICMP) usually requires administrative (root) rights.

Answer 2

I think this code will help you:

public class PingExample {     public static void main(String[] args){         try{             InetAddress address = InetAddress.getByName("192.168.1.103");             boolean reachable = address.isReachable(10000);              System.out.println("Is host reachable? " + reachable);         } catch (Exception e){             e.printStackTrace();         }     } }