Ubuntu Manpage: Smokeping::probes::CiscoRTTMonDNS.pm

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
        timeout = 15

        # [...]

        *** 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
        timeout = 15

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 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 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 (primary) 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 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

timeout
How long a single RTTMonDNS '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

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"*5+3 seconds (5
       secs is the timeout value hardcoded into this probe).