Re: [Resolverless-dns] Paper on Resolver-less DNS

Erik Sy <sy@informatik.uni-hamburg.de> Wed, 04 September 2019 13:52 UTC

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From: Erik Sy <sy@informatik.uni-hamburg.de>
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Date: Wed, 4 Sep 2019 15:51:55 +0200
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Subject: Re: [Resolverless-dns] Paper on Resolver-less DNS
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On 9/4/19 14:58, Bob Harold wrote:
>
> I find in Section 3.2.2:  "As a result, we recommend
> user agents to restrict the contexts in which they trust the DNS
> records retrieved via resolverless DNS. For example, web browsers can
> restrict the usage of such DNS records within the context of the same
> browser tab or the same website."
>
> But I don't understand what is meant by "the same website".  If it
> means the same hostname, then the DNS entry has already been found, to
> get to the website, and there is no need for resolverless DNS or any
> DNS lookup. 
This is correct if we speak about a simple website that does not require
the user agent to load resources from other hostnames.
> What else could it mean?

Note, that the retrieval of a popular website requires on average
connections to about 20 different hostnames. Thus, if the first
connection to an average website provides you the DNS records for the
remaining 19 hostnames then using resolver-less DNS can save up to 19
traditional DNS lookups.

Erik