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8.159. Net::Ping
Provides methods to create ping objects
and test the reachability of remote hosts on the network. After the
object has been created, a variable number of hosts can be pinged
multiple times before closing the connection. The methods are the
following.
| new |
$p = Net::Ping->new([proto[, def_timeout[, bytes]]])
Creates a new ping object. All arguments are optional. Takes the
following arguments:
proto
The protocol to use when doing a ping. Default is
udp. The possible protocols are:
icmp
Sends an icmp echo message to
the remote host. If the echoed message is received back correctly
from the remote host, that host is considered reachable. Requires the
program to be run as root or setuid to root.
tcp
Attempts to establish connection to remote host's
echo port. If successful, remote host is
considered reachable. No data is actually echoed. No special
privileges are required, but overhead is higher than for the others.
udp
Sends a udp packet to remote host's
echo port. If the echoed packet is received back
from the remote host and contains the same data that was sent, the
remote host is considered reachable. Requires no special privileges.
def_timeout
Default timeout in seconds to be used if timeout not passed to the
ping method. Must be greater than zero; defaults
to five seconds.
bytes
Number of bytes included in the ping packet sent to the remote host.
Ignored if protocol is tcp. Default is 1 if
protocol is udp, otherwise 0. These are also the
minimum number of bytes; the maximum is 1,024.
| close |
$p->close( )
Closes network connection for this ping object. The connection can
also be closed by undef $p and is automatically
closed if the ping object goes out of scope.
| ping |
$p->ping(host[, timeout])
Pings remote host and waits for a response. Takes the following
arguments:
host
Specified as either the hostname or the IP number of the remote host.timeout
Optional, must be greater than 0 seconds if
specified. Defaults to whatever was specified when the ping object
was created.
If host cannot be found, or if there is a
problem with the IP number, returns undef.
Otherwise, returns 1 if the host is reachable and
0 if it is not.
| pingecho |
pingecho (host[, timeout])
Provides backward compatibility with the previous version of
Net::Ping. Uses the tcp protocol, with return values and parameters
the same as described for ping.
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| 8.158. Net::NNTP |  | 8.160. Net::POP3 |
Copyright © 2002 O'Reilly & Associates. All rights reserved.
