PING(8)
NAME
ping, gping, traceroute − probe the Internet
SYNOPSIS
ping [ -d ] [ -i interval ] [ -s size ] [ -n count ] destination
gping [ -r ] [ -l ] [ -i interval ] destination [ destination ... ]
traceroute [ -dn ][ -t tries ] dest
DESCRIPTION
Ping sends ICMP echo requests to a system and returns the time for a response. It can be used to determine the network delay and whether or not the destination is up.
The options are:
n requests that a total of count messages be sent, default 32.
i sets the time between messages to be interval milliseconds, default 1000 ms.
s sets the length of the message to be size bytes, ICMP header included. The size cannot be smaller than 32 or larger than 8192. The default is 64.
d causes message numbers to be printed so that one can see the order with which messages are received and which are lost.
Gping is a ping with a graphical display. It presents separate graphs for each destination specified.
The options are:
r display round trip time in seconds. This is the default.
l display percentage of lost messages. A message is considered lost if not replied to in 10 seconds. The percentage is an exponentially weighted average.
i sets the time between messages to be interval milliseconds, default 5000 ms.
Graphs can be dropped and added using the button 3 menu. Clicking button 1 on a datapoint displays the value of the datapoint and the time it was recorded.
Traceroute displays the IP addresses and average round trip times to all routers between the machine it is run on and dest. It does this by sending packets to dest with increasing times to live (TTL) in their headers. Each router that a packet expires at replies with an ICMP warning message. The options are:
d print debugging to standard error
n just print out IP numbers, don’t try to look up the names of the routers.
t send tries packets at each TTL value (default 1).
SOURCE
/sys/src/cmd/ip/ping.c
/sys/src/cmd/ip/gping.c
/sys/src/cmd/ip/traceroute.c
Plan 9 — March 27, 2001