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
9 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Hi!
Very new to unix stuff, and this is my first post to the forum. I'm pretty sure I know enough to know I know nothing, so please be patient with me and don't laugh too hard.
Ok, I've got an old computer and a laptop - the old computer was bought in the mid 90's it's still running windows... (1 Reply)
Discussion started by: boredbody
1 Replies
2. Windows & DOS: Issues & Discussions
Hi,
I am trying to install WIndows 2003 R2 Server on existing Windows 2008 server. When I run the 2003 cd it says no disk found. What can be the problem. (2 Replies)
Discussion started by: gunnervarma
2 Replies
3. UNIX for Dummies Questions & Answers
Sometimes I observe this in gdb:
(gdb) br my_function
Breakpoint .. at 0x...: file ..., line ...
i.e., "my_function" does exist in the current executable.
however, dlsym does not find it:
(gdb) p dlsym(0,"my_function")
$6 = 0
This is a C program; dlsym does find other defined functions and... (2 Replies)
Discussion started by: sds
2 Replies
4. UNIX for Advanced & Expert Users
I'd like to get some opnions on choosing DNS server:
Windows DNS vs Linux BIND comparrsion:
1) managment, easy of use
2) Security
3) features
4) peformance
5) ??
I personally prefer Windows DNS server for management, it supports GUI and command line. But I am not sure about security... (2 Replies)
Discussion started by: honglus
2 Replies
5. UNIX for Advanced & Expert Users
Hi guys,
please help me get the answers of these questions which I faced in an interview @ Yahoo
1. I want to " ls " few million files, certainly I cannot do so because ls has some restriction in KBs, how can I do it alternatively.
2. Change the system in such a way that while booting up,... (2 Replies)
Discussion started by: gauravsharma29
2 Replies
6. IP Networking
Hey everyone,
Okay, so I've been having some fun with the dig command, and wanted to dig my old school. Two questions came up from this. So I:
dig @8.8.8.8 +recurse njcu.edu ANY
and the result is about 8 records, including the SOA record. One of them is this weird TXT record, and the other is... (1 Reply)
Discussion started by: Lost in Cyberia
1 Replies
7. Hardware
I have read a document which tells me the following 4 things are done by the RAM embedded on disk driver controller. But I don't know what's difference between buffer and cache. Thanks!
RAM on disk drive controllers
1 firmware
2 speed matching buffer
3 prefetching buffer
4 cache (1 Reply)
Discussion started by: 915086731
1 Replies
8. Solaris
I am trying to find the home directory of users on a UNIX (Solaris/AIX) box using
echo ~usernameThis does return the home directory for all valid users. For some reason this command also outputs home directory which are non-existent for few users who seem not to have logon access to that... (31 Replies)
Discussion started by: thinkster
31 Replies
9. Solaris
Hi,
We have built a new server (RHEL VM)and added that IP/hostname into dns zone configs file on DNS server (Solaris 10). Reloaded the configuration using
and added nameserver into resolv.conf on client. But when I am trying nslookup, its not getting resolved. The nameserver is not able to... (8 Replies)
Discussion started by: snchaudhari2
8 Replies
LEARN ABOUT CENTOS
net::dns::resolver::recurse
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 v5.16.3 2012-12-28 Net::DNS::Resolver::Recurse(3)