PING(8C) MAINTENANCE COMMANDS PING(8C)
NAME
ping - send ICMP ECHO_REQUEST packets to network hosts
SYNOPSIS
/usr/etc/ping host [ timeout ]
/usr/etc/ping [ -s ] [ -lrRv ] host [ packetsize ] [ count ]
AVAILABILITY
This program is available with the Networking software
installation option. Refer to Installing SunOS 4.1 for
information on how to install optional software.
DESCRIPTION
ping utilizes the ICMP protocol's mandatory ECHO_REQUEST
datagram to elicit an ICMP ECHO_RESPONSE from the specified
host , or network gateway. ECHO_REQUEST datagrams, or
"pings," have an IP and ICMP header, followed by a
structtimeval, and then an arbitrary number of bytes to pad
out the packet. If host responds, ping will print host is
alive on the standard output and exit. Otherwise after
timeout seconds, it will write no answer from host. The
default value of timeout is 20 seconds.
When the -s flag is specified, ping sends one datagram per
second, and prints one line of output for every
ECHO_RESPONSE that it receives. No output is produced if
there is no response. In this second form, ping computes
round trip times and packet loss statistics; it displays a
summary of this information upon termination or timeout.
The default datagram packet size is 64 bytes, or you can
specify a size with the packetsize command-line argument.
If an optional count is given, ping sends only that number
of requests.
When using ping for fault isolation, first `ping' the local
host to verify that the local network interface is running.
OPTIONS
-l Loose source route. Use this option in the IP header to
send the packet to the given host and back again. Usu-
ally specified with the -R option.
-r Bypass the normal routing tables and send directly to a
host on an attached network. If the host is not on a
directly-attached network, an error is returned. This
option can be used to ping a local host through an
interface that has been dropped by the router daemon,
see routed(8C).
-R Record route. Sets the IP record route option, which
will store the route of the packet inside the IP
header. The contents of the record route will only be
printed if the -v option is given, and only be set on
return packets if the target host preserves the record
route option across echos, or the -l option is given.
-v Verbose output. List any ICMP packets, other than
ECHO_RESPONSE, that are received.
SEE ALSO
icmp(4P), ifconfig(8C), netstat(8C), rpcinfo(8C), spray(8C)
Sun Release 4.1 Last change: 10 May 1988
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