06-27-2007
disabiling telnet and ftp from reversing DNS
Hello Everybody:
Im facing a weird problem over here. Eventhough my UNIX servers (sol9& tru64) are stand alone servers, and they dont see or use the DNS server, but recently after crash in our DNS and replacing it with new one and new IP, when I try to telnet or FTP some of these servers from different hosts, most of them is taking too much time (3-5 mnts) to connect, which is causing some application to declare session as timed out or failed.
when I added the hosts IPs to my local host file it worked out, since I cant add all my users to the local hosts, I heared if I disabled the reverse DNS option form telnet and FTP configuration it can work out also, my question is how I can disable this property or IF you have any other ideas in mind so I can overcome this Issue.
Thanks alot guys and sorry for making it long.
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LEARN ABOUT MOJAVE
net::dns::resolver::recurse5.18
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 1096 2012-12-28 13:35:15Z willem $
perl v5.18.2 2014-01-16 Net::DNS::Resolver::Recurse(3)