[dns-operations] FlagDay 2020 UDP Size

[Paul Vixie]

On Monday, 3 August 2020 17:20:30 UTC jack tavares wrote:
> I am asking for a clarification on the recommended default settings for
> Resolvers etc.
> 
> I understand that the default setting should be 1232.

that's been proposed, and contested.

> 
> But what is not clearly laid out, in my opinion, is if;
> a client sends a larger EDNS buffer size, what should the resolver do?
> 
> Currently the resolvers i work with have a max of 4096 by default, and will
> respect a LOWER limit
> from a client, but cap the response at 4k.
> 
> Is it ok to go higher, if we set the default at 4k?

see also:

https://tools.ietf.org/html/draft-fujiwara-dnsop-avoid-fragmentation-02

-- 
Paul