Special Forums Windows & DOS: Issues & Discussions Home Questions Tags Users Unanswered Windows 2016 DNS server returns SERVFAIL for non-existing doma Post 303043615 by broy32000 on Sunday 2nd of February 2020 06:44:47 AM
Thanks. Just 2 comments:
1. In our company, we had a big service outage because of secondary DNS server going down. At the first thought we were surprised why requests were even trying to go to the secondary. Then we found out it was because a lot of SERVFAIL in the primary one even in normal circumstances. I wonder how the companies handle Windows DNS servers.

2. I realize that if Windows DNS server is set up to forward the query to another DNS server (tested in non-windows one) one then SERVAIL does not happen
Test Your Knowledge in Computers #270
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Net::DNS::Nameserver(3) 				User Contributed Perl Documentation				   Net::DNS::Nameserver(3)

Net::DNS::Nameserver - DNS server class SYNOPSIS
"use Net::DNS::Nameserver;" DESCRIPTION
Instances of the "Net::DNS::Nameserver" class represent simple DNS server objects. See "EXAMPLE" for an example. METHODS
new my $ns = Net::DNS::Nameserver->new( LocalAddr => "", LocalPort => "5353", ReplyHandler => &reply_handler, Verbose => 1 ); Creates a nameserver object. Attributes are: LocalAddr IP address on which to listen. Defaults to INADDR_ANY. LocalPort Port on which to listen. Defaults to 53. ReplyHandler Reference to reply-handling subroutine. Required. Verbose Print info about received queries. Defaults to 0 (off). The ReplyHandler subroutine is passed the query name, query class, and query type. It must return the response code and references to the answer, authority, and additional sections of the response. Common response codes are: NOERROR No error FORMERR Format error SERVFAIL Server failure NXDOMAIN Non-existent domain (name doesn't exist) NOTIMP Not implemented REFUSED Query refused See RFC 1035 and the IANA dns-parameters file for more information: ftp://ftp.rfc-editor.org/in-notes/rfc1035.txt http://www.isi.edu/in-notes/iana/assignments/dns-parameters The nameserver will listen for both UDP and TCP connections. On Unix-like systems, the program will probably have to run as root to listen on the default port, 53. A non-privileged user should be able to listen on ports 1024 and higher. Returns a Net::DNS::Nameserver object, or undef if the object couldn't be created. See "EXAMPLE" for an example. main_loop $ns->main_loop; Start accepting queries. EXAMPLE
The following example will listen on port 5353 and respond to all queries for A records with the IP address All other queries will be answered with NXDOMAIN. Authority and additional sections are left empty. #!/usr/bin/perl -Tw use Net::DNS; use strict; sub reply_handler { my ($qname, $qclass, $qtype) = @_; my ($rcode, @ans, @auth, @add); if ($qtype eq "A") { my ($ttl, $rdata) = (3600, ""); push @ans, Net::DNS::RR->new("$qname $ttl $qclass $qtype $rdata"); $rcode = "NOERROR"; } else { $rcode = "NXDOMAIN"; } return ($rcode, @ans, @auth, @add); } my $ns = Net::DNS::Nameserver->new( LocalPort => 5353, ReplyHandler => &reply_handler, Verbose => 1 ); if ($ns) { $ns->main_loop; } else { die "couldn't create nameserver object "; } BUGS
Net::DNS::Nameserver objects can handle only one query at a time. COPYRIGHT
Copyright (c) 2000-2002 Michael Fuhr. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. SEE ALSO
perl(1), Net::DNS, Net::DNS::Resolver, Net::DNS::Packet, Net::DNS::Update, Net::DNS::Header, Net::DNS::Question, Net::DNS::RR, RFC 1035 perl v5.8.0 2002-05-31 Net::DNS::Nameserver(3)

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