Programatically ICMP . ICMP ( /Unix & Windows) java JNI exec. ICMP Java JNI NIO.


= �172.16.0.2�
int = 3000; // i 3
= InetAddress.getByName () .isReachable ()

reachable ; . , unreachable . ICMP , TCP 7 () .

/Unix suid java ICMP, suid. Windows ICMP .