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Full Discussion: HP-UX DNS issue
Operating Systems HP-UX HP-UX DNS issue Post 302887312 by methyl on Thursday 6th of February 2014 06:56:56 PM
Old 02-06-2014
Assuming that 192.168.1.1 and 192.168.1.2 are both DNS servers and that they are Primary and Secondary respectively.

You can test whether they are both working DNS servers with:
nslookup microsoft.com 192.168.1.1
nslookup microsoft.com 192.168.2.1

The /etc/nsswitch.conf posted will give up if the Primary DNS is down.
With "NOTFOUND=return" first I don't think that your server will ever look at the secondary (or any reserve) DNS's listed in your /etc/resolv.conf .

Unless your server does tons of DNS lookups on computers which are for some reason not in your DNS, imho this is much better:

hosts: dns [NOTFOUND=continue UNAVAIL=continue TRYAGAIN=continue] files

(I cut/paste this from one of my long-term reliable computers. Not my original work and I would like to credit the tip, but it's been too long).

Last edited by methyl; 02-06-2014 at 08:02 PM..
 

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Net::DNS::RR::APL(3)					User Contributed Perl Documentation				      Net::DNS::RR::APL(3)

NAME
Net::DNS::RR::APL - DNS APL resource record SYNOPSIS
use Net::DNS; $rr = new Net::DNS::RR('name IN APL aplist'); DESCRIPTION
DNS Address Prefix List (APL) record METHODS
The available methods are those inherited from the base class augmented by the type-specific methods defined in this package. Use of undocumented package features or direct access to internal data structures is discouraged and could result in program termination or other unpredictable behaviour. aplist @aplist = $rr->aplist; @aplist = $rr->aplist( '1:192.168.32.0/21', '!1:192.168.38.0/28' ); @aplist = $rr->aplist( '1:224.0.0.0/4', '2:FF00:0:0:0:0:0:0:0/8' ); @aplist = $rr->aplist( negate => 1, family => 1, address => '192.168.38.0', prefix => 28, ); Ordered, possibly empty, list of address prefix items. Additional items, if present, are appended to the existing list with neither prefix aggregation nor reordering. Net::DNS::RR::APL::Item Each element of the prefix list is a Net::DNS::RR::APL::Item object which is inextricably bound to the APL record which created it. negate $rr->negate(0); $rr->negate(1); if ( $rr->negate ) { ... } Boolean attribute indicating the prefix to be an address range exclusion. family $family = $rr->family; Address family discriminant. prefix $prefix = $rr->prefix; Number of bits comprising the address prefix. address $address = $object->address; Address portion of the prefix list item. string $string = $object->string; Returns the prefix list item in the form required in zone files. COPYRIGHT
Copyright (c)2008 Olaf Kolkman, NLnet Labs. Portions Copyright (c)2011 Dick Franks. Package template (c)2009,2012 O.M.Kolkman and R.W.Franks. All rights reserved. This program is free software; you may redistribute it and/or modify it under the same terms as Perl itself. SEE ALSO
perl, Net::DNS, Net::DNS::RR, RFC3123 perl v5.18.2 2014-01-16 Net::DNS::RR::APL(3)
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