NAME

       Smokeping::probes::TCPPing - TCPPing Probe for SmokePing

SYNOPSIS

        *** Probes ***

        +TCPPing

        binary = /usr/bin/tcpping # mandatory
        forks = 5
        offset = 50%
        step = 300
        tcptraceroute = -e "sudo /bin/tcptraceroute"
        timeout = 15

        # The following variables can be overridden in each target section
        pings = 5
        port = 80

        # [...]

        *** Targets ***

        probe = TCPPing # if this should be the default probe

        # [...]

        + mytarget
        # probe = TCPPing # if the default probe is something else
        host = my.host
        pings = 5
        port = 80

DESCRIPTION

       Integrates TCPPing as a probe into smokeping. The variable binary must point to your copy
       of the TCPPing program. If it is not installed on your system yet, you can get it from
       http://www.vdberg.org/~richard/tcpping.  You can also get it from
       http://www.darkskies.za.net/~norman/scripts/tcpping.

       The (optional) port option lets you configure the port for the pings sent.  The TCPPing
       manpage has the following to say on this topic:

       The problem is that with the widespread use of firewalls on the modern Internet, many of
       the packets that traceroute(8) sends out end up being filtered, making it impossible to
       completely trace the path to the destination.  However, in many cases, these firewalls
       will permit inbound TCP packets to specific ports that hosts sitting behind the firewall
       are listening for connections on.  By sending out TCP SYN packets instead of UDP or ICMP
       ECHO packets, tcptraceroute is able to bypass the most common firewall filters.

       It is worth noting that tcptraceroute never completely establishes a TCP connection with
       the destination host. If the host is not listening for incoming connections, it will
       respond with an RST indicating that the port is closed. If the host instead responds with
       a SYN|ACK, the port is known to be open, and an RST is sent by the kernel tcptraceroute is
       running on to tear down the connection without completing three-way handshake. This is the
       same half-open scanning technique that nmap(1) uses when passed the -sS flag.

VARIABLES

       Supported probe-specific variables:

       binary
           The location of your tcpping script.

           Example value: /usr/bin/tcpping

           This setting is mandatory.

       forks
           Run this many concurrent processes at maximum

           Example value: 5

           Default value: 5

       offset
           If you run many probes concurrently you may want to prevent them from hitting your
           network all at the same time. Using the probe-specific offset parameter you can change
           the point in time when each probe will be run. Offset is specified in % of total
           interval, or alternatively as 'random', and the offset from the 'General' section is
           used if nothing is specified here. Note that this does NOT influence the rrds itself,
           it is just a matter of when data acqusition is initiated.  (This variable is only
           applicable if the variable 'concurrentprobes' is set in the 'General' section.)

           Example value: 50%

       step
           Duration of the base interval that this probe should use, if different from the one
           specified in the 'Database' section. Note that the step in the RRD files is fixed when
           they are originally generated, and if you change the step parameter afterwards, you'll
           have to delete the old RRD files or somehow convert them. (This variable is only
           applicable if the variable 'concurrentprobes' is set in the 'General' section.)

           Example value: 300

       tcptraceroute
           tcptraceroute Options to pass to tcpping.

           Example value: -e "sudo /bin/tcptraceroute"

       timeout
           How long a single 'ping' takes at maximum

           Example value: 15

           Default value: 5

       Supported target-specific variables:

       pings
           How many pings should be sent to each target, if different from the global value
           specified in the Database section. Note that the number of pings in the RRD files is
           fixed when they are originally generated, and if you change this parameter afterwards,
           you'll have to delete the old RRD files or somehow convert them.

           Example value: 5

       port
           The TCP port the probe should measure.

           Example value: 80

AUTHORS

       Norman Rasmussen <norman@rasmussen.co.za> Patched for Smokeping 2.x compatibility by Anton
       Chernev <maznio@doom.bg>