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Sunday, September 29, 2013

BACKTRACK 5 R3 : dnstracer

1.  Dnstracer is another in the line of information gathering tool in Backtrack 5 R3 that 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. It basically works by sending the specified name-server a non-recursive request for the name. 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.

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The switches available with the command line are :

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As can be made out from the screen shhot above,the option switches have variety to offer and thus a whole lot of basic info on the specific DNS can be churned out.The syntax of the command is :

dnstracer [options] [host]

-c:    disable local caching, default enabled
-C:   enable negative caching, default disabled
-o:    enable overview of received answers, default disabled
-q     : query-type to use for the DNS requests, default A
-r     : amount of retries for DNS requests, default 3
-s      : use this server for the initial request

-t      : Limit time to wait per try
-v     : verbose
-S      : use this source address.
-4     : don't query IPv6 servers

In the screen shots below I have taken example of the for running the command on.....the command run is


dnstracer -q soa -o

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(Click on the image to enlarge)

Running the command with and without switches effects the final output of info as seen in the info....


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