On 24/04/14 11:49, Aaron Wood wrote:

>> Dnsmasq does the DS query next because the answer to the A query comes
>> back unsigned, so dnsmasq is looking for a DS record that proves this is
>> OK. It's likely that Verisign does that top-down (starting from the
>> root) whilst dnsmasq does it bottom up. Hence Verisign never finds the
>> broken DS, whilst dnsmasq does.
>> That's as good an analysis as I can produce right now. Anyone who can
>> shed more light, please do.
>> (And yes, please report DNSSEC problems  on the dnsmasq-discuss list for
>> preference.)
> This is still persisting (and it appears to be blocking a bunch of Apple
> software update functions).  From your comments, Simon, it sounds like you
> think this is an Akamai issue, and should be reported to them?

I'm not absolutely sure that this isn't also a dnsmasq problem, and
DNSSEC is still capable of surprising me, but I can't see how a SERVFAIL
answer to

dig @ DS e3191.dscc.akamaiedge.net.0.1.cn.akamaiedge.net

can not be either a Google ('cause it's their recursive server) or
Akamai problem.

Poking further, it looks like the authoritative name servers for that
zone are

; <<>> DiG 9.8.1-P1 <<>> @ NS cn.akamaiedge.net
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 43031
;; flags: qr rd ra; QUERY: 1, ANSWER: 9, AUTHORITY: 0, ADDITIONAL: 0

;cn.akamaiedge.net.             IN      NS

cn.akamaiedge.net.      299     IN      NS      n7cn.akamaiedge.net.
cn.akamaiedge.net.      299     IN      NS      n6cn.akamaiedge.net.
cn.akamaiedge.net.      299     IN      NS      n0cn.akamaiedge.net.
cn.akamaiedge.net.      299     IN      NS      n2cn.akamaiedge.net.
cn.akamaiedge.net.      299     IN      NS      n5cn.akamaiedge.net.
cn.akamaiedge.net.      299     IN      NS      n4cn.akamaiedge.net.
cn.akamaiedge.net.      299     IN      NS      n3cn.akamaiedge.net.
cn.akamaiedge.net.      299     IN      NS      n1cn.akamaiedge.net.
cn.akamaiedge.net.      299     IN      NS      n8cn.akamaiedge.net.

and all of those give sensible answers for

DS e3191.dscc.akamaiedge.net.0.1.cn.akamaiedge.net

except n8cn.akamaiedge.net, which isn't responding, so I rather think
this may be a Google mess.

Or maybe it's Great Firewall induced breakage?



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