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.\" ========================================================================
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.IX Title "doc::Smokeping::probes::TCPPing 3"
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.TH doc::Smokeping::probes::TCPPing 3 "2008-04-26" "2.3.6" "SmokePing"
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Smokeping::probes::TCPPing \- TCPPing Probe for SmokePing
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.IX Header "SYNOPSIS"
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\& binary = /usr/bin/tcpping # mandatory
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\& # The following variables can be overridden in each target section
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\& probe = TCPPing # if this should be the default probe
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\& # probe = TCPPing # if the default probe is something else
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.IX Header "DESCRIPTION"
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Integrates TCPPing as a probe into smokeping. The variable \fBbinary\fR must
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point to your copy of the TCPPing program. If it is not installed on
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your system yet, you can get it from http://www.vdberg.org/~richard/tcpping.
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You can also get it from http://www.darkskies.za.net/~norman/scripts/tcpping.
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The (optional) port option lets you configure the port for the pings sent.
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The TCPPing manpage has the following to say on this topic:
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The problem is that with the widespread use of firewalls on the modern Internet,
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many of the packets that \fItraceroute\fR\|(8) sends out end up being filtered,
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making it impossible to completely trace the path to the destination.
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However, in many cases, these firewalls will permit inbound \s-1TCP\s0 packets to specific
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ports that hosts sitting behind the firewall are listening for connections on.
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By sending out \s-1TCP\s0 \s-1SYN\s0 packets instead of \s-1UDP\s0 or \s-1ICMP\s0 \s-1ECHO\s0 packets,
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tcptraceroute is able to bypass the most common firewall filters.
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It is worth noting that tcptraceroute never completely establishes a \s-1TCP\s0 connection
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with the destination host. If the host is not listening for incoming connections,
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it will respond with an \s-1RST\s0 indicating that the port is closed. If the host instead
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responds with a SYN|ACK, the port is known to be open, and an \s-1RST\s0 is sent by
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the kernel tcptraceroute is running on to tear down the connection without completing
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three-way handshake. This is the same half-open scanning technique that \fInmap\fR\|(1) uses
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when passed the \-sS flag.
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.IX Header "VARIABLES"
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Supported probe-specific variables:
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The location of your TCPPing script.
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Example value: /usr/bin/tcpping
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This setting is mandatory.
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Run this many concurrent processes at maximum
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If you run many probes concurrently you may want to prevent them from
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hitting your network all at the same time. Using the probe-specific
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offset parameter you can change the point in time when each probe will
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be run. Offset is specified in % of total interval, or alternatively as
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\&'random', and the offset from the 'General' section is used if nothing
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is specified here. Note that this does \s-1NOT\s0 influence the rrds itself,
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it is just a matter of when data acqusition is initiated.
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(This variable is only applicable if the variable 'concurrentprobes' is set
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in the 'General' section.)
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Duration of the base interval that this probe should use, if different
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from the one specified in the 'Database' section. Note that the step in
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the \s-1RRD\s0 files is fixed when they are originally generated, and if you
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change the step parameter afterwards, you'll have to delete the old \s-1RRD\s0
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files or somehow convert them. (This variable is only applicable if
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the variable 'concurrentprobes' is set in the 'General' section.)
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How long a single 'ping' takes at maximum
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Supported target-specific variables:
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How many pings should be sent to each target, if different from the global
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value specified in the Database section. Note that the number of pings in
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the \s-1RRD\s0 files is fixed when they are originally generated, and if you
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change this parameter afterwards, you'll have to delete the old \s-1RRD\s0
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files or somehow convert them.
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The \s-1TCP\s0 port the probe should measure.
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Norman Rasmussen <norman@rasmussen.org>
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Patched for Smokeping 2.x compatibility by Anton Chernev <maznio@doom.bg>
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doc/Smokeping/probes/Smokeping::probes::TCPPing.3
