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).