93 lines
3.1 KiB
Plaintext
93 lines
3.1 KiB
Plaintext
DNSTRACER(8) General Commands Manual DNSTRACER(8)
|
|
|
|
NAME
|
|
dnstracer - trace a chain of DNS servers to the source
|
|
|
|
SYNOPSIS
|
|
dnstracer [options] name
|
|
|
|
DESCRIPTION
|
|
dnstracer 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.
|
|
|
|
Options are:
|
|
|
|
-c Disable local caching.
|
|
|
|
-C Enable negative caching.
|
|
|
|
-o Enable overview of received answers at the end.
|
|
|
|
-q queryclass
|
|
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, soa, cname, hinfo, mx, ns, txt and ptr.
|
|
|
|
-r retries
|
|
Number of retries for DNS requests, default 3.
|
|
|
|
-s server
|
|
DNS server to use for the initial request, default is aquired
|
|
from the system. If a dot is specified (.), A.ROOT-SERVERS.NET
|
|
will be used.
|
|
|
|
-v Be verbose on what sent or received.
|
|
|
|
-4 Use only IPv4 servers, don't query IPv6 servers (only available
|
|
when IPv6 support hasn't been disabled)
|
|
|
|
-S sourceaddress
|
|
Use this as source-address for the outgoing packets.
|
|
|
|
HOW IT WORKS
|
|
It sends the specified name-server a non-recursive request for the
|
|
name.
|
|
|
|
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.
|
|
|
|
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.
|
|
|
|
The program stops if all name-servers are queried.
|
|
|
|
Make sure the server you're querying doesn't do forwarding towards
|
|
other servers, as dnstracer is not able to detect this for you.
|
|
|
|
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.
|
|
|
|
EXAMPLES
|
|
Search for the A record of www.mavetju.org on your local nameserver:
|
|
|
|
dnstracer www.mavetju.org
|
|
|
|
Search for the MX record of mavetju.org on the root-nameservers:
|
|
|
|
dnstracer "-s" . "-q" mx mavetju.org
|
|
|
|
Search for the PTR record (hostname) of 212.204.230.141:
|
|
|
|
dnstracer "-q" ptr 141.230.204.212.in-addr.arpa
|
|
|
|
And for IPv6 addresses:
|
|
|
|
dnstracer "-q" ptr "-s" . "-o"
|
|
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
|
|
|
|
SEE ALSO
|
|
ntptrace(8), traceroute(8), dig(1)
|
|
|
|
AUTHOR
|
|
Edwin Groothuis, edwin@mavetju.org (http://www.mavetju.org)
|
|
|
|
See http://www.mavetju.org/contacts.php for mailing-lists.
|
|
|
|
February 10, 2008 February 10, 2008 DNSTRACER(8)
|