[dns-operations] Is this valid edns0 query?

Mohamed Lrhazi Mohamed.Lrhazi at georgetown.edu
Fri Oct 10 20:05:56 UTC 2014


F5 are asking me for time to debug.. while Google is saying "All our
appliances do this, nobody else is complaining...".. Just saying, I prefer
the former response so far.

Thanks,
Mohamed.

On Fri, Oct 10, 2014 at 3:20 PM, Jared Mauch <jared at puck.nether.net> wrote:

>
> > On Oct 10, 2014, at 2:54 PM, Hugo Salgado <hsalgado at nic.cl> wrote:
> >
> >
> > On 10/10/2014 03:24 PM, Roland Dobbins wrote:
> >>
> >> On Oct 11, 2014, at 1:07 AM, Mohamed Lrhazi <
> Mohamed.Lrhazi at georgetown.edu> wrote:
> >>
> >>> The appliance vendor, Google, tells me that edns0 opt code 20732 must
> be "the service name", whatever that means....
> >>
> >> I don't know what that means in the context of a non-SRV query . . .
> can you turn off the F5's 'malformed DNS query' scrubbing and see what
> happens?
> >>
> >
> > Well... F5 is known of misbehavior with its aggressive filtering,
> > even with AAAA records some time ago:
> >  http://hugo.salga.do/post/50030273426/quad-a-blocking-in-dns
>
> I’ve never had success with F5 and DNS packet handling properly going all
> the way back to Nov 1998 timeframe.  One of their engineers was
> troubleshooting it in our offices of my employer at the time and ended up
> upset and saying “why doesn’t this work” when it was broken vs being able
> to properly triage it.
>
> I’m expecting someone from F5 to email me because at the time when I
> posted about the issue on NANOG they were aggressive in trying to defend a
> public view of their product and legitimate technical problems.
>
> - Jared
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