Special Forums IP Networking DNS: Dig returns different responses... Post 302885973 by fpmurphy on Wednesday 29th of January 2014 09:29:01 AM
A recursive query (which by the way is the default setting in dig) has nothing to do with returning subdomains.

If a DNS server does not have the requested information when it receives a recursive query, it queries other DNS servers until it gets the information, or until the query fails.
 
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Net::DNS::Resolver::Recurse(3)				User Contributed Perl Documentation			    Net::DNS::Resolver::Recurse(3)

NAME
Net::DNS::Resolver::Recurse - Perform recursive dns lookups SYNOPSIS
use Net::DNS::Resolver::Recurse; my $res = Net::DNS::Resolver::Recurse->new; DESCRIPTION
This module is a sub class of Net::DNS::Resolver. So the methods for Net::DNS::Resolver still work for this module as well. There are just a couple methods added: 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 ", $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"); IPv6 transport If the appropriate IPv6 libraries are installed the recursive resolver will randomly choose between IPv6 and IPv4 addresses of the nameservers it encounters during recursion. If you want to force IPv4 transport use the force_v4() method. Also see the IPv6 transport notes in the Net::DNS::Resolver documentation. AUTHOR
Rob Brown, bbb@cpan.org SEE ALSO
Net::DNS::Resolver, COPYRIGHT
Copyright (c) 2002, Rob Brown. All rights reserved. Portions Copyright (c) 2005, Olaf M Kolkman. This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. $Id: Recurse.pm 740 2008-12-17 23:20:53Z olaf $ perl v5.12.1 2009-12-30 Net::DNS::Resolver::Recurse(3)

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