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Smokeping_probes_CiscoRTTMonDNS(3) SmokePingSmokeping_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
	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).

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 documentation 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>

2.7.3				  2020-08-30Smokeping_probes_CiscoRTTMonDNS(3)

NAME | SYNOPSIS | DESCRIPTION | VARIABLES | AUTHORS | NOTES | BUGS | SEE ALSO

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