doc::Smokeping::probes::doc::Smokeping::probes::CiscoRTTMonDNS(3)



NAME
       Smokeping::probes::CiscoRTTMonDNS.pm - Probe for SmokePing

SYNOPSIS
        *** Probes ***

        +CiscoRTTMonDNS

        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
        name = www.foobar.com.au # mandatory
        pings = 5

        # [...]

        *** Targets ***

        probe = CiscoRTTMonDNS # if this should be the default probe

        # [...]

        + mytarget
        # probe = CiscoRTTMonDNS # if the default probe is something else
        host = my.host
        ioshost = RTTcommunity@Myrouter.foobar.com.au # mandatory
        iosint = 10.33.22.11
        name = www.foobar.com.au # mandatory
        pings = 5

DESCRIPTION
       A probe for smokeping, which uses the ciscoRttMon MIB
       functionality ("Service Assurance Agent", "SAA") of Cisco
       IOS to time ( recursive, type A) DNS queries to a DNS
       server.

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 vari-
           able 'concurrentprobes' is set in the 'General' sec-
           tion.)

           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 send the DNS requests, 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 DNS packets.  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 DNS packets. By default IOS uses the (pri-
           mary) IP address on the sending interface as source
           address for packets originated by the router.

           Example value: 10.33.22.11

       name
           The (mandatory) name parameter is the DNS name to
           resolve.

           Example value: www.foobar.com.au

           This setting is mandatory.

       pings
           How many pings should be sent to each target, if dif-
           ferent 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

AUTHORS
       Joerg.Kummer at Roche.com

NOTES
       host parameter

       The host parameter specifies the DNS server, which the
       router will use.

       IOS VERSIONS

       This probe only works with 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
       ($SMOKEPINGINSTALLDIR)/lib/Smokeping and CiscoRTTMonDNS.pm
       to ($SMOKEPINGINSTALLDIR)/lib/Smokeping/probes.

       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 does unnecessary DNS queries, i.e. more than
       configured in the "pings" variable, because the RTTMon MIB
       only allows to set a total time for all queries in one
       measurement run (one "life"). Currently the probe sets the
       life duration to "pings"*2+3 seconds (2 secs is the time-
       out value hardcoded into this probe).

SEE ALSO
       <http://oss.oetiker.ch/smokeping/>

       <http://www.switch.ch/misc/leinen/snmp/perl/>

       The best source for background info on SAA is Cisco's doc-
       umentation on <http://www.cisco.com> and the CISCO-RTTMON-
       MIB documentation, which is available at:

       <ftp://ftp.cisco.com/pub/mibs/v2/CISCO-RTTMON-MIB.my>



2.0.9                   doc::Smokeping::probes::CiscoRTTMonDNS(3)
