Re: Dns sometimes fails using Google DNS / automatic dnssec

[Yunhong Gu <guu () google com>]

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 () 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 () 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