hints

Initialize the hint servers. Recursive queries need a starting name server to work off of. This method takes a list of IP addresses to use as the starting servers. These name servers should be authoritative for the root (.) zone.

  $res->hints(@ips);

If no hints are passed, the default nameserver is asked for the hints. Normally these IPs can be obtained from the following location:

  ftp://ftp.internic.net/domain/named.root

recursion_callback

This method is takes a code reference, which is then invoked each time a packet is received during the recursive lookup. For example to emulate dig's "+trace" function:

 $res->recursion_callback(sub {
     my $packet = shift;
     $_->print for $packet->additional;
     printf(";; Received %d bytes from %s\n\n",
         $packet->answersize,
         $packet->answerfrom
     );
 });

query_dorecursion

This method is much like the normal query() method except it disables the recurse flag in the packet and explicitly performs the recursion.

  $packet = $res->query_dorecursion( "www.netscape.com.", "A");