Dns sometimes fails using Google DNS / automatic dnssec
Yunhong Gu
guu at google.com
Thu Nov 15 17:29:18 UTC 2012
Hi, we have found the bug that caused this problem. It was introduced
in a very recent release. The fix is on its way.
Thanks very much for the report,
Yunhong
On Thu, Nov 15, 2012 at 12:26 PM, Jay Ford <jay-ford at uiowa.edu> wrote:
> It looks like if the server has the RRSIG RR, it returns it. For example, a
> query with +dnssec will cause it to cache the RRSIG, after which it returns
> it even if +dnssec not specified.
>
> ________________________________________________________________________
> Jay Ford, Network Engineering Group, Information Technology Services
> University of Iowa, Iowa City, IA 52242
> email: jay-ford at uiowa.edu, phone: 319-335-5555, fax: 319-335-2951
>
> ________________________________________
> query without +dnssec before RRSIG is cached; RRSIG not returned
> ________________________________________
>
> : dig @8.8.8.8 m1.mailplus.nl
>
> ; <<>> DiG 9.8.1-P1 <<>> @8.8.8.8 m1.mailplus.nl
>
> ; (1 server found)
> ;; global options: +cmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 3665
>
> ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
>
> ;; QUESTION SECTION:
> ;m1.mailplus.nl. IN A
>
> ;; ANSWER SECTION:
> m1.mailplus.nl. 2985 IN A 46.31.50.16
>
> ;; Query time: 15 msec
> ;; SERVER: 8.8.8.8#53(8.8.8.8)
> ;; WHEN: Thu Nov 15 11:22:02 2012
> ;; MSG SIZE rcvd: 48
>
> ________________________________________
> query with +dnssec; RRSIG is returned
> ________________________________________
>
> : dig +dnssec +multi @8.8.8.8 m1.mailplus.nl
>
> ; <<>> DiG 9.8.1-P1 <<>> +dnssec +multi @8.8.8.8 m1.mailplus.nl
>
> ; (1 server found)
> ;; global options: +cmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 58877
> ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1
>
> ;; OPT PSEUDOSECTION:
> ; EDNS: version: 0, flags: do; udp: 512
>
> ;; QUESTION SECTION:
> ;m1.mailplus.nl. IN A
>
> ;; ANSWER SECTION:
> m1.mailplus.nl. 2978 IN A 46.31.50.16
> m1.mailplus.nl. 2978 IN RRSIG A 7 3 3600 20130517082302 (
>
> 20121115082302 3767 mailplus.nl.
>
> WzKY2FnTbF8MOhAuDvnrPkpgskeH4aI1YByh6zBX1z1p
>
> QRo8YIcxzlSNtHv2LnKUk+0n6iIXqV77sHynHHP/Y/a0
>
> bMKYKIDuK8Gtz47AVDJaU0eX0FR8F5qqw897ClGf5ISa
> 0njPLFVyF/NJ6hNViDYzOhhHGi58dhZmhKWFujs= )
>
> ;; Query time: 16 msec
> ;; SERVER: 8.8.8.8#53(8.8.8.8)
> ;; WHEN: Thu Nov 15 11:22:10 2012
> ;; MSG SIZE rcvd: 230
>
> ________________________________________
> query without +dnssec after RRSIG is cached; RRSIG returned
> ________________________________________
>
> : dig +multi @8.8.8.8 m1.mailplus.nl
>
> ; <<>> DiG 9.8.1-P1 <<>> +multi @8.8.8.8 m1.mailplus.nl
>
> ; (1 server found)
> ;; global options: +cmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 13524
>
> ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0
>
> ;; QUESTION SECTION:
> ;m1.mailplus.nl. IN A
>
> ;; ANSWER SECTION:
> m1.mailplus.nl. 2974 IN A 46.31.50.16
> m1.mailplus.nl. 2974 IN RRSIG A 7 3 3600 20130517082302 (
>
> 20121115082302 3767 mailplus.nl.
>
> WzKY2FnTbF8MOhAuDvnrPkpgskeH4aI1YByh6zBX1z1p
>
> QRo8YIcxzlSNtHv2LnKUk+0n6iIXqV77sHynHHP/Y/a0
>
> bMKYKIDuK8Gtz47AVDJaU0eX0FR8F5qqw897ClGf5ISa
> 0njPLFVyF/NJ6hNViDYzOhhHGi58dhZmhKWFujs= )
>
> ;; Query time: 17 msec
> ;; SERVER: 8.8.8.8#53(8.8.8.8)
> ;; WHEN: Thu Nov 15 11:22:13 2012
> ;; MSG SIZE rcvd: 219
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