ISC DLV

Paul Vixie vixie at isc.org
Sun Apr 5 02:00:53 CDT 2009


Paul Ferguson <fergdawgster at gmail.com> writes:

> On Sat, Apr 4, 2009 at 9:55 PM, Marcelo Gardini do Amaral
> <mgardini at gmail.com> wrote:
>
>> Guys,
>>
>> are you having problems to validate DNSEC using ISC DLV?
>>
>
> No idea, but I did see another reference to this over on the OARC dns-ops
> list:
>
> https://lists.dns-oarc.net/pipermail/dns-operations/2009-April/003726.html

note, this isn't a ddos, so it's probably not related to the other dns ddos
events that have been discussed here recently.

see also geoff's reply on that thread:

Date: Sat, 04 Apr 2009 23:15:55 -0700
From: "Geoffrey Sisson" <geoff at geoff.co.uk>
To: dns-operations at lists.dns-oarc.net
Subject: Re: [dns-operations] ISC DLV broken?
Sender: dns-operations-bounces at lists.dns-oarc.net

mvn at ucla.edu (Michael Van Norman) wrote:

> Starting a bit after 18:00, my home machines starting failing DNSSEC
> validation using the ISC DLV.
...
> Are other people seeing this?

Yes, starting at around the same time (PDT).

Peter_Losher at isc.org (Peter Losher) wrote:

> ISC is aware that there is a issue with lookups against dlv.isc.org and
> are investigating the cause behind it.  You may want to disable DNSSEC
> validation against dlv.isc.org at this time.

It appears as if the RRSIG RRset returned by the DLV nameservers for
"dlv.isc.org" is missing the RRSIG for the KSK, so validation for
dlv.isc.org is failing.  It _does_ contain the RRSIG for the ZSK (key
id 64263).

As a test I tried changing the trusted key to the ZSK, and DLV validation
appeared to work correctly.  This is, of course, not a recommended
work-around.

Geoff
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