[dns-operations] EDNS buffer size on TCP connections?

[Florian Weimer]

On 06/22/2016 06:03 PM, Ray Bellis wrote:
> On 22/06/2016 16:48, Wessels, Duane wrote:
>
>> RFC 6891 section 6.2.4 describes its use by responders.
>
> This text appears to be lifted straight from section 4.5.4 of RFC 2671.
>
> IMHO, it's wrong headed, because it's inconsistent with the
> message-by-message semantics of EDNS0 :(

I don't think EDNS is strictly per-message.  There is a negotiation 
mechanism which requires preserving state across messages.

Florian