[dns-operations] EDNS client-subnet best practice?

[Paul Vixie]

On Wednesday, 3 June 2020 12:44:53 UTC Chris Adams wrote:
> What is considered current best practice for recursive servers on
> enabling EDNS client-subnet?

most full resolvers leave it completely off. sometimes because the full 
resolver shares topology with its stub resolvers, and ECS would be redundant. 
other times it's because of privacy concerns, where the full resolver is 
trying to be a blender through which the identity of the stub clients cannot 
be as reliably guessed. my own motive is that i'm expecting the CDNs of the 
world to redirect me at the HTTP layer, which they must be able to do because 
ECS is non-ubiquitous, and i reject the complexity of ECS as being a design 
error designed by the marketing department.

see also: https://queue.acm.org/detail.cfm?id=1647302

vixie