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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
Old 02-02-2020
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 #493
Difficulty: Medium
When a program executes, each command executes one after the other, top-to-bottom. This is known as inconsequential control flow.
True or False?

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Mail::DKIM::DNS(3)					User Contributed Perl Documentation					Mail::DKIM::DNS(3)

NAME
Mail::DKIM::DNS - performs DNS queries for Mail::DKIM DESCRIPTION
This is the module that performs DNS queries for Mail::DKIM. CONFIGURATION
This module has a couple configuration settings that the caller may want to use to customize the behavior of this module. $Mail::DKIM::DNS::TIMEOUT This global variable specifies the maximum amount of time (in seconds) to wait for a single DNS query to complete. The default is 10. Mail::DKIM::DNS::resolver() Use this global subroutine to get or replace the instance of Net::DNS::Resolver that Mail::DKIM uses. If set to undef (the default), then a brand new default instance of Net::DNS::Resolver will be created the first time a DNS query is needed. You will call this subroutine if you want to specify non-default options to Net::DNS::Resolver, such as different timeouts, or to enable use of a persistent socket. For example: # first, construct a custom DNS resolver my $res = Net::DNS::Resolver->new( udp_timeout => 3, tcp_timeout => 3, retry => 2, ); $res->udppacketsize(1240); $res->persistent_udp(1); # then, tell Mail::DKIM to use this resolver Mail::DKIM::DNS::resolver($res); Mail::DKIM::DNS::enable_EDNS0() This is a convenience subroutine that will construct an appropriate DNS resolver that uses EDNS0 (Extension mechanisms for DNS) to support large DNS replies, and configure Mail::DKIM to use it. (As such, it should NOT be used in conjunction with the resolver() subroutine described above.) Mail::DKIM::DNS::enable_EDNS0(); Use of EDNS0 is recommended, since it reduces the need for falling back to TCP when dealing with large DNS packets. However, it is not enabled by default because some Internet firewalls which do deep inspection of packets are not able to process EDNS0-enabled packets. When there is a firewall on a path to a DNS resolver, the EDNS0 feature should be specifically tested before enabling. AUTHOR
Jason Long, <jlong@messiah.edu> COPYRIGHT AND LICENSE
Copyright (C) 2006-2007, 2012-2013 by Messiah College This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.6 or, at your option, any later version of Perl 5 you may have available. perl v5.18.2 2013-02-07 Mail::DKIM::DNS(3)

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