- trace a chain of DNS servers to the source
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.
- Disable local caching.
- Enable negative caching.
- 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
acquired from the system. If a dot is specified (.), A.ROOT-SERVERS.NET
will be used.
- Be verbose on what sent or received.
- 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.
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 authoritative 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.
Search for the A record of www.mavetju.org on your local nameserver:
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 18.104.22.168:
dnstracer "-q" ptr 22.214.171.124.in-addr.arpa
And for IPv6 addresses:
dnstracer "-q" ptr "-s" . "-o"
Edwin Groothuis, firstname.lastname@example.org (http://www.mavetju.org)
See http://www.mavetju.org/contacts.php for mailing-lists.