Monday, 25 June 2012

dnstracer on backtrack 5


dnstracer 
dnstracer

Introduction 

       dnstracer - trace a chain of DNS servers to the source .

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
-cDisable 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.
-vBe 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.
HOW TO OPEN DNSTRACER
  • BackTrack > Information Gathering > Network Analysis > DNS Analysis > dnstracer
dnstracer path

dnstracer



EXAMPLE 1 : Help Option

dnstracer -h


EXAMPLE 2 : 
  • Command Syntax : dnstracer < url >
  • See the below image for more details - 


EXAMPLE 3 : Disabled local caching , default enabled
  • Command Syntax : dnstracer [ option ] < url > 
  • See the below image for more details - 


Example 4 : Enabled Negative caching , default enabled 
  • Command Used : dnstracer -C < url > 
  • See the below image for more details - 


Example 5 : enabled overview of recieved answers
  • Command Used : dnstracer -o < url >
  • See the below image for more details - 
dnstracer -o url


Example 6 : Verbose mode 
  • Command Used : dnstracer -v google.com 
  • See the below image for more details - 
dnstracer verbose mode

This is how you can use this tool , more example will be added soon .

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THIS TUTORIAL IS JUST FOR EDUCATIONAL PURPOSE ONLY /- 

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