Why DNSSEC errors for bund.de?
cet1 at cam.ac.uk
Tue May 24 15:08:21 UTC 2011
On May 24 2011, I wrote:
>We are getting DNSSEC-related SERVFAILs on names in bund.de (e.g.
>mx1.bind.de). This happens with all of BIND 9.7.3-P1, 9.7.4b1 and
>9.8.0-P1 configured with the root and dlv.isc.org trust anchors.
>However, I can't see what is actually wrong with it, using dig +cd as
>necessary. All the signatures appear to have valid start/stop times, and
>http://dnsviz.net/d/mx1.bund.de/dnssec/ seems pretty happy with it. There
>are a lot of false trails (e.g. the DS records for it in "de") but that
>shouldn't stop BIND finding the one that works (DLV in dlv.isc.org ->
>KSK with tag 10923 -> ZSK with tag 4814), should it?
>It may be significant that this problem was reported to us on the same
>day that obscured DNSKEY records were introduced into the "de" zone...
That seems almost certain to be the precipitating event, in fact.
I can produce the same effect for all 31 zones that are both registered
in dlv.isc.org *and* have a DS record in dlv.isc.org:
Among other oddities:
dig +dnssec dnskey [zone] gives the right answer *without* the ad bit
dig +dnssec soa [zone] gives SERVFAIL, unless +cd is used as well.
Email: cet1 at cam.ac.uk
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