On Jul 10, 2018, at 17:22, Adam Roach <[email protected]> wrote:

> Basically, you're describing a solution space that could be realized as 
> something like:
>
> <img src="https://example.com/img/f.jpg"; ip="192.0.2.1">

Ok, interesting. I would suggest considering a richer scheme that
accommodates address families and multiple addresses with priorities,
but I see how that kind of thing would allow a client to do so
certificate matching and resource retrieval without using the DNS.

> But this is really equivalent in just about every important way to sending 
> the normal <img src="https://example.com/img/f.jpg";> along with a pushed DNS 
> record that indicates that "example.com" resolves to "192.0.2.1" -- and this 
> latter thing is (to my understanding, at least) in scope of the conversation 
> that Patrick is proposing to have.

My question is why you would involve the DNS at all if all the
performance-based resolution decisions can be made without it. You're
just adding cost and complexity without benefit.

> Note: I'm not saying anything about the trust issues that arise in either 
> case, and I'm not trying to gloss over the need to perform a really careful 
> analysis;

Likewise. However, I think DNS protocol advice is probably more useful
as input to the analysis if it's clear that the DNS is necessarily
involved.


Joe

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