Net::Ping Net::Ping is a Perl module to check a remote host for reachability.
Download

Net::Ping Ranking & Summary

Net::Ping Tags

network Perl module remote host check remote host ping remote host

Net::Ping Description

Net::Ping is a Perl module to check a remote host for reachability. Net::Ping is a Perl module to check a remote host for reachability.SYNOPSIS use Net::Ping; $p = Net::Ping->new(); print "$host is alive.n" if $p->ping($host); $p->close(); $p = Net::Ping->new("icmp"); $p->bind($my_addr); # Specify source interface of pings foreach $host (@host_array) { print "$host is "; print "NOT " unless $p->ping($host, 2); print "reachable.n"; sleep(1); } $p->close(); $p = Net::Ping->new("tcp", 2); # Try connecting to the www port instead of the echo port $p->port_number(getservbyname("http", "tcp")); while ($stop_time > time()) { print "$host not reachable ", scalar(localtime()), "n" unless $p->ping($host); sleep(300); } undef($p); # Like tcp protocol, but with many hosts $p = Net::Ping->new("syn"); $p->port_number(getservbyname("http", "tcp")); foreach $host (@host_array) { $p->ping($host); } while (($host,$rtt,$ip) = $p->ack) { print "HOST: $host ACKed in $rtt seconds.n"; } # High precision syntax (requires Time::HiRes) $p = Net::Ping->new(); $p->hires(); ($ret, $duration, $ip) = $p->ping($host, 5.5); printf("$host is alive (packet return time: %.2f ms)n", 1000 * $duration) if $ret; $p->close(); # For backward compatibility print "$host is alive.n" if pingecho($host);This module contains methods to test the reachability of remote hosts on a network. A ping object is first created with optional parameters, a variable number of hosts may be pinged multiple times and then the connection is closed.You may choose one of six different protocols to use for the ping. The "tcp" protocol is the default. Note that a live remote host may still fail to be pingable by one or more of these protocols. For example, www.microsoft.com is generally alive but not "icmp" pingable.With the "tcp" protocol the ping() method attempts to establish a connection to the remote host's echo port. If the connection is successfully established, the remote host is considered reachable. No data is actually echoed. This protocol does not require any special privileges but has higher overhead than the "udp" and "icmp" protocols.Specifying the "udp" protocol causes the ping() method to send a udp packet to the remote host's echo port. If the echoed packet is received from the remote host and the received packet contains the same data as the packet that was sent, the remote host is considered reachable. This protocol does not require any special privileges. It should be borne in mind that, for a udp ping, a host will be reported as unreachable if it is not running the appropriate echo service. For Unix-like systems see inetd(8) for more information.If the "icmp" protocol is specified, the ping() method sends an icmp echo message to the remote host, which is what the UNIX ping program does. If the echoed message is received from the remote host and the echoed information is correct, the remote host is considered reachable. Specifying the "icmp" protocol requires that the program be run as root or that the program be setuid to root.If the "external" protocol is specified, the ping() method attempts to use the Net::Ping::External module to ping the remote host. Net::Ping::External interfaces with your system's default ping utility to perform the ping, and generally produces relatively accurate results. If Net::Ping::External if not installed on your system, specifying the "external" protocol will result in an error.If the "syn" protocol is specified, the ping() method will only send a TCP SYN packet to the remote host then immediately return. If the syn packet was sent successfully, it will return a true value, otherwise it will return false. NOTE: Unlike the other protocols, the return value does NOT determine if the remote host is alive or not since the full TCP three-way handshake may not have completed yet. The remote host is only considered reachable if it receives a TCP ACK within the timeout specified. To begin waiting for the ACK packets, use the ack() method as explained below. Use the "syn" protocol instead the "tcp" protocol to determine reachability of multiple destinations simultaneously by sending parallel TCP SYN packets. It will not block while testing each remote host. demo/fping is provided in this distribution to demonstrate the "syn" protocol as an example. This protocol does not require any special privileges. Requirements: · Perl

Net::Ping Related Software