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.TH dnstracer 8 "February 24, 2002" "February 24, 2002" "General Commands Manual"
.UC
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.rm #[ #] #H #V #F C
.SH "NAME"
\fBdnstracer\fR \- trace a chain of DNS servers to the source
.SH "SYNOPSIS"
\fBdnstracer\fR [\fBoptions\fR] \fIname\fR
.SH "DESCRIPTION"
\fBdnstracer\fR determines where a given Domain Name Server (DNS) gets
its information from, and follows the chain of DNS servers back to
the servers which know the data.
.PP
Options are:
.Ip "\fB\-c\fR" 8
Disable local caching.
.Ip "\fB\-o\fR" 8
Enable overview of received answers at the end.
.Ip "\fB\-q \fIqueryclass\fR\fR" 8
Change the query-class, default is A. You can either specify a
number of the type (if you're brave) or one of the following strings:
a, aaaa, a6, cname, hinfo, mx, ns, txt.
.Ip "\fB\-r \fIretries\fR\fR" 8
Number of retries for \s-1DNS\s0 requests, default 3.
.Ip "\fB\-s \fIserver\fR\fR" 8
\s-1DNS\s0 server to use for the initial request, default is aquired from
the system. If a dot is specified (.), A.\s-1ROOT\s0\-\s-1SERVERS\s0.\s-1NET\s0 will be
used.
.Ip "\fB\-t \fItimeout\fR\fR" 8
Timeout to wait for \s-1DNS\s0 answers, default 15 seconds.
.Ip "\fB\-v\fR" 8
Be verbose on what sent or received.
.SH "HOW IT WORKS"
It sends the specified name-server a non-recursive request for the
name.
.PP
Non-recursive means: if the name-server knows it, it will return
the data requested. If the name-server doesn't know it, it will
return pointers to name-servers that are authoritive for the domain
part in the name or it will return the addresses of the root
name-servers.
.PP
If the name server does returns an authoritative answer for the name,
the next server is queried. If it returns an non-authoritative
answer for the name, the name servers in the authority records will
be queried.
.PP
The program stops if all name-servers are queried.
.PP
Make sure the server you're querying doesn't do forwarding towards
other servers, as dnstracer is not able to detect this for you.
.PP
It detects so called lame servers, which are name-servers which has
been told to have information about a certain domain, but don't
have this information.
.SH "SEE ALSO"
\fBntptrace\fR\|(8), \fBtraceroute\fR\|(8), \fBdig\fR\|(1)
.SH "AUTHOR"
Edwin Groothuis, edwin@mavetju.org (http://www.mavetju.org)
.PP
See http://www.mavetju.org/contacts.php for mailing-lists.
.SH "BUGS"
If you are running dnscache of D. J. Bernstein on your local machine
this program is useless. Dnscache ignores non-recursive requests.

.rn }` ''
.IX Title "dnstracer 8"
.IX Name "B<dnstracer> - trace a chain of DNS servers to the source"

.IX Header "NAME"

.IX Header "SYNOPSIS"

.IX Header "DESCRIPTION"

.IX Item "\fB\-c\fR"

.IX Item "\fB\-o\fR"

.IX Item "\fB\-q \fIqueryclass\fR\fR"

.IX Item "\fB\-r \fIretries\fR\fR"

.IX Item "\fB\-s \fIserver\fR\fR"

.IX Item "\fB\-t \fItimeout\fR\fR"

.IX Item "\fB\-v\fR"

.IX Header "HOW IT WORKS"

.IX Header "SEE ALSO"

.IX Header "AUTHOR"

.IX Header "BUGS"