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Top Forums UNIX for Advanced & Expert Users One of the two DNS server going down causes impacts Post 303043087 by broy32000 on Friday 17th of January 2020 11:45:58 PM
Old 01-18-2020
Hi Neo,
One DNS server out of two failed only once. And that caused impact. We are able to reproduce the problem. We want to find out why the impact is felt even though the other DNS server was fine. The impact was reported only for AIX hosted services

--- Post updated at 05:45 AM ---

Since we have not found any reason at upper layer, we want to investigate at "netstat" layer. There we found that netstat does not report DNS requests
 

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

NAME
Net::DNS::RR::NSAP - DNS NSAP resource record SYNOPSIS
"use Net::DNS::RR"; DESCRIPTION
Class for DNS Network Service Access Point (NSAP) resource records. METHODS
idp print "idp = ", $rr->idp, " "; Returns the RR's initial domain part (the AFI and IDI fields). dsp print "dsp = ", $rr->dsp, " "; Returns the RR's domain specific part (the DFI, AA, Rsvd, RD, Area, ID, and SEL fields). afi print "afi = ", $rr->afi, " "; Returns the RR's authority and format identifier. "Net::DNS" currently supports only AFI 47 (GOSIP Version 2). idi print "idi = ", $rr->idi, " "; Returns the RR's initial domain identifier. dfi print "dfi = ", $rr->dfi, " "; Returns the RR's DSP format identifier. aa print "aa = ", $rr->aa, " "; Returns the RR's administrative authority. rsvd print "rsvd = ", $rr->rsvd, " "; Returns the RR's reserved field. rd print "rd = ", $rr->rd, " "; Returns the RR's routing domain identifier. area print "area = ", $rr->area, " "; Returns the RR's area identifier. id print "id = ", $rr->id, " "; Returns the RR's system identifier. sel print "sel = ", $rr->sel, " "; Returns the RR's NSAP selector. NOTE
COPYRIGHT
Copyright (c) 1997-2002 Michael Fuhr. Portions Copyright (c) 2002-2004 Chris Reinhardt. 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(1), Net::DNS, Net::DNS::Resolver, Net::DNS::Packet, Net::DNS::Header, Net::DNS::Question, Net::DNS::RR, RFC 1706. perl v5.18.2 2014-01-16 Net::DNS::RR::NSAP(3)
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