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110 lines
3.5 KiB
Groff
110 lines
3.5 KiB
Groff
.TH echoping 1 "November 22, 1996" "ECHOPING" "echoping"
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.SH NAME
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echoping \- tests a remote host with TCP or UDP
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.SH SYNOPSIS
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.B echoping
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.RI [ -vudcr ]
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.RI [ -s\ number ]
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.RI [ -n\ number ]
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.RI [ -w\ number ]
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.RI [ -t\ number ]
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.RI [ -h\ URL ]
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.RI [ -i\ URL ]
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.B hostname
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[:port]
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.SH DESCRIPTION
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.LP
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.B echoping
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is a small program to test (approximatively) performances
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of a remote Internet host by sending it TCP "echo" packets. It can use other
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protocols as well (HTTP, UDP "echo", etc).
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.LP
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.B echoping
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simply shows the elapsed time, including the time to set up the TCP
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connection and to transfer the data. Therefore, it is unsuitable to physical
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line raw throughput measures (unlike bing or treno). On the other end, the
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action it performs are close from, for instance, a HTTP request and it is meaningful
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to use it (carefully) to measure Web performances.
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.SH ARGUMENT
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.IP hostname[:port]
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Name of the server to test. For HTTP, you can specify a port number.
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.SH OPTIONS
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.IP -v
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Verbose
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.IP -s\ nnn
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Size of the data to send. Large values can produce strange results with
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some echo servers.
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.IP -n\ nnn
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Numbers of repeated tests. With this option, you have also the minimum, maximum, average and median
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time. The median is the value such that half of the measures are under it
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and the other half is above. When you measure highly variables values, like
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it is often the case on the whole Internet, median is better than average
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to avoid "extreme" values.
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.IP -w\ nnn
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Number of seconds to wait between two tests (default is one)
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.IP -t\ nnn
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Number of seconds to wait a reply before giving up. For TCP, this is the
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maximum number of seconds for the whole connection (setup and data exchange).
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.IP -u
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Use UDP instead of TCP
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.IP -d
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Use the "discard" service instead of echo
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.IP -c
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Use the "chargen" service instead of echo
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.IP -h\ url
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Use the HTTP protocol (instead of echo) for the given URL. The URL has to
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be a relative one (for instance '/' or '/pics/foobar.gif') because HTTP 1.0
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servers will not understand a request for an absolute URL.
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.IP -i\ url
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Use the ICP protocol (instead of echo) for the given URL. The URL has to
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be an absolute one. This is mostly for testing Squid Web proxy/caches.
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.IP -r
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Use T/TCP (if it has been compiled with it). See the INSTALL file for details.
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.IP -f\ character
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Fill the packet with this character (default is random filling)
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.SH EXAMPLES
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.IP echoping\ \-v\ foobar.whoops.org
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Tests the remote machine with TCP echo (one test).
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.IP echoping\ \-n\ 5\ \-w\ 10\ foobar.whoops.org
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Tests the remote machine with TCP echo (five tests, every ten seconds).
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.IP echoping\ \-h\ /\ foobar.whoops.org
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Tests the remote Web server and asks its home page. Note you don't
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indicate the whole URL.
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.IP echoping\ \-h\ http://www.whoops.org/\ cache.whoops.org:3128
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Tests the remote Web proxy-cache and asks a Web page. Note that you must
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indicate the whole URL.
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.SH BUGS
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UDP isn't really useable with large packets because of sockets
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limitations and the lack of workaround code.
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ICP support is far from perfect, specially on the Alpha or when
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something goes wrong (filtering for instance).
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If a Web page is empty,
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.B echoping
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will display meaningless messages.
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Timeouts on TCP connections are a bit experimental.
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Since
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.B echoping
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writes everything to the server, then begins to read the reply, some echo
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servers
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will timeout if you send very long messages, because they expect you to
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start to read right now.
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.SH SEE ALSO
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See the README for information about other network measurements programs.
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.SH AUTHOR
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Stephane Bortzmeyer <bortzmeyer@pasteur.fr>
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