Ubuntu Manpage: Smokeping::probes::CiscoRTTMonTcpConnect

NAME

       Smokeping::probes::CiscoRTTMonTcpConnect - Probe for SmokePing

SYNOPSIS

        *** Probes ***

        +CiscoRTTMonTcpConnect

        forks = 5
        offset = 50%
        step = 300
        timeout = 15

        # The following variables can be overridden in each target section
        ioshost = RTTcommunity@Myrouter.foobar.com.au # mandatory
        iosint = 10.33.22.11
        pings = 5
        port = 80
        timeout = 15
        tos = 160

        # [...]

        *** Targets ***

        probe = CiscoRTTMonTcpConnect # if this should be the default probe

        # [...]

        + mytarget
        # probe = CiscoRTTMonTcpConnect # if the default probe is something else
        host = my.host
        ioshost = RTTcommunity@Myrouter.foobar.com.au # mandatory
        iosint = 10.33.22.11
        pings = 5
        port = 80
        timeout = 15
        tos = 160

DESCRIPTION

       A probe for smokeping, which uses the ciscoRttMon MIB functionality ("Service Assurance
       Agent", "SAA") of Cisco IOS to measure TCP connect times between a Cisco router and a TCP
       server. The measured value is the time is the time to establish a TCP session, i.e. the
       time between the initial "SYN" TCP packet of the router and the "SYN ACK" packet of the
       host. The router terminates the TCP session immediately after the reception of "SYN ACK"
       with a "FIN" packet.

VARIABLES

Supported probe-specific variables:

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

timeout
How long a single 'ping' takes at maximum

Example value: 15

Default value: 5

Supported target-specific variables:

ioshost
The (mandatory) ioshost parameter specifies the Cisco router, which will establish the
TCP connections as well as the SNMP community string on the router.

Example value: RTTcommunity@Myrouter.foobar.com.au

This setting is mandatory.

iosint
The (optional) iosint parameter is the source address for the TCP connections. This
should be one of the active (!) IP addresses of the router to get results. IOS looks
up the target host address in the forwarding table and then uses the interface(s)
listed there to send the TCP packets. By default IOS uses the (primary) IP address on
the sending interface as source address for a connection.

Example value: 10.33.22.11

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 (optional) port parameter lets you configure the destination TCP port on the host.
The default is the http port 80.

Default value: 80

timeout
How long a single RTTMon TcpConnect 'ping' take at maximum plus 10 seconds to spare.
Since we control our own timeout the only purpose of this is to not have us killed by
the ping method from basefork.

Example value: 15

Default value: 15

tos The (optional) tos parameter specifies the value of the ToS byte in the IP header of
the packets from the router. Multiply DSCP values times 4 and Precedence values times
32 to calculate the ToS values to configure, e.g. ToS 160 corresponds to a DSCP value
40 and a Precedence value of 5. Please note that this will not influence the ToS value
in the packets sent by the the host.

Example value: 160

Default value: 0

AUTHORS

       Joerg.Kummer at Roche.com

NOTES

   IOS VERSIONS
       This probe only works with Cisco IOS 12.0(3)T or higher. It is recommended to test it on
       less critical routers first.

   INSTALLATION
       To install this probe copy ciscoRttMonMIB.pm to ($SMOKEPINGINSTALLDIR)/Smokeping/lib and
       CiscoRTTMonTcpConnect.pm to ($SMOKEPINGINSTALLDIR)/lib/Smokeping/probes. V0.97 or higher
       of Simon Leinen's SNMP_Session.pm is required.

       The router(s) must be configured to allow read/write SNMP access. Sufficient is:

               snmp-server community RTTCommunity RW

       If you want to be a bit more restrictive with SNMP write access to the router, then
       consider configuring something like this

               access-list 2 permit 10.37.3.5
               snmp-server view RttMon ciscoRttMonMIB included
               snmp-server community RTTCommunity view RttMon RW 2

       The above configuration grants SNMP read-write only to 10.37.3.5 (the smokeping host) and
       only to the ciscoRttMon MIB tree. The probe does not need access to SNMP variables outside
       the RttMon tree.

BUGS

       The probe establishes unnecessary connections, i.e. more than configured in the "pings"
       variable, because the RTTMon MIB only allows to set a total time for all connections in
       one measurement run (one "life"). Currently the probe sets the life duration to
       "pings"*5+3 seconds (5 secs is the timeout value hardcoded into this probe).