Bind - OPT UDPsize=1232 ?
kpielorz_lst at tdx.co.uk
Tue Jun 1 14:01:14 UTC 2021
--On 1 June 2021 at 13:03:12 +0200 Anand Buddhdev <anandb at ripe.net> wrote:
> On 01/06/2021 12:55, Karl Pielorz wrote:
> Hi Karl,
>> Anyone know why the Bind query appears to set such a low UDPsize? -
>> We've nothing in our config setting sizes, or maximums.
> Here's an answer:
Thanks for the pointer - ok, yes I can see it's probably EDNS / Flag day
related etc. I missed that - probably as it's never caused us an issue.
Annoyingly a value of 1232 causes a TCP fallback to a server out of our
control that doesn't do TCP very well.
Even more annoyingly - all the 'flag day' / online test sites we can find -
it works with, and passes all the tests.
Which means even if there were a chance of getting the remote server fixed
it's going to get "well, it works everywhere else and the online tests say
it's a pass..."
Thanks again though,
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