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.\" ========================================================================
.\"
.IX Title "doc::Smokeping::probes::AnotherDNS 3"
.TH doc::Smokeping::probes::AnotherDNS 3 "2008-07-24" "2.4.2" "SmokePing"
.SH "NAME"
Smokeping::probes::AnotherDNS \- Alternate DNS Probe
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& *** Probes ***
.Ve
.PP
.Vb 1
\& +AnotherDNS
.Ve
.PP
.Vb 3
\& forks = 5
\& offset = 50%
\& step = 300
.Ve
.PP
.Vb 9
\& # The following variables can be overridden in each target section
\& lookup = www.example.org
\& mininterval = 0.5
\& pings = 5
\& port = 53
\& recordtype = A
\& require_answers = 0
\& require_noerror = 0
\& timeout = 5
.Ve
.PP
.Vb 1
\& # [...]
.Ve
.PP
.Vb 1
\& *** Targets ***
.Ve
.PP
.Vb 1
\& probe = AnotherDNS # if this should be the default probe
.Ve
.PP
.Vb 1
\& # [...]
.Ve
.PP
.Vb 11
\& + mytarget
\& # probe = AnotherDNS # if the default probe is something else
\& host = my.host
\& lookup = www.example.org
\& mininterval = 0.5
\& pings = 5
\& port = 53
\& recordtype = A
\& require_answers = 0
\& require_noerror = 0
\& timeout = 5
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Like \s-1DNS\s0, but uses Net::DNS and Time::HiRes instead of dig. This probe does
*not* retry the request three times before it is considerd \*(L"lost\*(R", like dig and
other resolver do by default. If operating as caching Nameserver, \s-1BIND\s0 (and
maybe others) expect clients to retry the request if the answer is not in the
cache. So, ask the nameserver for something that he is authoritative for if you
want measure the network packet loss correctly. 
.PP
If you have a really fast network and nameserver, you will notice that this
probe reports the query time in microsecond resolution. :\-)
.SH "VARIABLES"
.IX Header "VARIABLES"
Supported probe-specific variables:
.IP "forks" 4
.IX Item "forks"
Run this many concurrent processes at maximum
.Sp
Example value: 5
.Sp
Default value: 5
.IP "offset" 4
.IX Item "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 \s-1NOT\s0 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.)
.Sp
Example value: 50%
.IP "step" 4
.IX Item "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 \s-1RRD\s0 files is fixed when they are originally generated, and if you
change the step parameter afterwards, you'll have to delete the old \s-1RRD\s0
files or somehow convert them. (This variable is only applicable if
the variable 'concurrentprobes' is set in the 'General' section.)
.Sp
Example value: 300
.PP
Supported target-specific variables:
.IP "lookup" 4
.IX Item "lookup"
Name of the host to look up in the dns.
.Sp
Example value: www.example.org
.IP "mininterval" 4
.IX Item "mininterval"
Minimum time between sending two lookup queries in (possibly fractional) seconds.
.Sp
Default value: 0.5
.IP "pings" 4
.IX Item "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 \s-1RRD\s0 files is fixed when they are originally generated, and if you
change this parameter afterwards, you'll have to delete the old \s-1RRD\s0
files or somehow convert them.
.Sp
Example value: 5
.IP "port" 4
.IX Item "port"
The \s-1UDP\s0 Port to use.
.Sp
Default value: 53
.IP "recordtype" 4
.IX Item "recordtype"
Record type to look up.
.Sp
Default value: A
.IP "require_answers" 4
.IX Item "require_answers"
Only Count Answers with answer count >= this value.
.Sp
Default value: 0
.IP "require_noerror" 4
.IX Item "require_noerror"
Only Count Answers with Response Status \s-1NOERROR\s0.
.Sp
Default value: 0
.IP "timeout" 4
.IX Item "timeout"
Timeout for a single request in seconds.
.Sp
Default value: 5
.SH "AUTHORS"
.IX Header "AUTHORS"
Christoph Heine <Christoph.Heine@HaDiKo.DE>