226 lines
6.9 KiB
Groff
226 lines
6.9 KiB
Groff
.\" Automatically generated by Pod::Man v1.37, Pod::Parser v1.32
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.\" ========================================================================
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.\"
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.IX Title "DNSTRACER 8"
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.TH DNSTRACER 8 "February 10, 2008" "February 10, 2008" "General Commands Manual"
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.SH "NAME"
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\&\fBdnstracer\fR \- trace a chain of DNS servers to the source
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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\&\fBdnstracer\fR [\fBoptions\fR] \fIname\fR
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fBdnstracer\fR determines where a given Domain Name Server (\s-1DNS\s0) gets
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its information from, and follows the chain of \s-1DNS\s0 servers back to
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the servers which know the data.
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.PP
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Options are:
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.IP "\fB\-c\fR" 8
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.IX Item "-c"
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Disable local caching.
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.IP "\fB\-C\fR" 8
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.IX Item "-C"
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Enable negative caching.
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.IP "\fB\-o\fR" 8
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.IX Item "-o"
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Enable overview of received answers at the end.
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.IP "\fB\-q \f(BIqueryclass\fB\fR" 8
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.IX Item "-q queryclass"
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Change the query\-class, default is A. You can either specify a
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number of the type (if you're brave) or one of the following strings:
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a, aaaa, a6, soa, cname, hinfo, mx, ns, txt and ptr.
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.IP "\fB\-r \f(BIretries\fB\fR" 8
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.IX Item "-r retries"
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Number of retries for \s-1DNS\s0 requests, default 3.
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.IP "\fB\-s \f(BIserver\fB\fR" 8
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.IX Item "-s server"
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\&\s-1DNS\s0 server to use for the initial request, default is aquired from
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the system. If a dot is specified (.), A.ROOT\-SERVERS.NET will be
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used.
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.IP "\fB\-v\fR" 8
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.IX Item "-v"
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Be verbose on what sent or received.
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.IP "\fB\-4\fR" 8
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.IX Item "-4"
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Use only IPv4 servers, don't query IPv6 servers (only available
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when IPv6 support hasn't been disabled)
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.IP "\fB\-S \f(BIsourceaddress\fB\fR" 8
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.IX Item "-S sourceaddress"
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Use this as source-address for the outgoing packets.
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.SH "HOW IT WORKS"
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.IX Header "HOW IT WORKS"
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It sends the specified name-server a non-recursive request for the
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name.
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.PP
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Non-recursive means: if the name-server knows it, it will return
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the data requested. If the name-server doesn't know it, it will
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return pointers to name-servers that are authoritive for the domain
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part in the name or it will return the addresses of the root
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name\-servers.
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.PP
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If the name server does returns an authoritative answer for the name,
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the next server is queried. If it returns an non-authoritative
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answer for the name, the name servers in the authority records will
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be queried.
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.PP
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The program stops if all name-servers are queried.
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.PP
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Make sure the server you're querying doesn't do forwarding towards
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other servers, as dnstracer is not able to detect this for you.
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.PP
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It detects so called lame servers, which are name-servers which has
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been told to have information about a certain domain, but don't
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have this information.
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.SH "EXAMPLES"
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.IX Header "EXAMPLES"
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Search for the A record of www.mavetju.org on your local nameserver:
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.PP
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dnstracer www.mavetju.org
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.PP
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Search for the \s-1MX\s0 record of mavetju.org on the root\-nameservers:
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.PP
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dnstracer \f(CW\*(C`\-s\*(C'\fR . \f(CW\*(C`\-q\*(C'\fR mx mavetju.org
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.PP
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Search for the \s-1PTR\s0 record (hostname) of 212.204.230.141:
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.PP
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dnstracer \f(CW\*(C`\-q\*(C'\fR ptr 141.230.204.212.in\-addr.arpa
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.PP
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And for IPv6 addresses:
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.PP
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dnstracer \f(CW\*(C`\-q\*(C'\fR ptr \f(CW\*(C`\-s\*(C'\fR . \f(CW\*(C`\-o\*(C'\fR 2.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.6.4.0.2.0.0.0.0.8.b.0.e.f.f.3.ip6.int
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIntptrace\fR\|(8), \fItraceroute\fR\|(8), \fIdig\fR\|(1)
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.SH "AUTHOR"
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.IX Header "AUTHOR"
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Edwin Groothuis, edwin@mavetju.org (http://www.mavetju.org)
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.PP
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See http://www.mavetju.org/contacts.php for mailing\-lists.
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