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       dnstrace - dns lookup tool


       dnstrace t fqdn r


       dnstrace searches for all DNS servers that can affect the resolution of
       records of type t under the domain name fqdn, starting  from  the  root
       server r.  You can list more than one root server.

       dnstrace  uses  the  standard DNS resolution algorithm, but follows all
       possible paths in the algorithm.  It prints all responses  it  receives
       from  DNS  servers;  it  also  prints warnings about slow servers, dead
       servers, misdelegated (‘‘lame’’)  servers,  and  misformatted  packets.
       dnstrace  is  similar  in  spirit  to  DOC and dnswalk but is much more
       effective than those tools at debugging resolution problems.

       In  versions  1.03  and  above:   You   can   pipe   dnstrace   through
       dnstracesort(1)  for  human-friendly  output.  dnstrace can take a long
       time to run, so standard procedure is to save its output in a file:

         dnstrace any > AOL &

       Then you can run dnstracesort(1) to see the results so far:

         dnstracesort < AOL | less

       The dnstracesort(1) output uses ul codes for  boldface  and  underline;
       these codes are displayed properly by less(1).

       Beware  that,  as  of  January  2001,  dnstrace  produces  more  than 5
       megabytes of output for the complete trace of  starting  from
       all  the  root  servers.   It ends up sending more than 6000 queries to
       more than 200 different servers.


       dnsip(1),   dnsipq(1),   dnsmx(1),   dnstxt(1),   dnsqr(1),    dnsq(1),
       dnsname(1), less(1), tinydns-get(1)