[RSSAC Caucus] Updating the RSSAC FAQ

[Fred Baker]

Question: I understood the statement to be that *resolvers* could fall back to TCP, not that the universe behind solvers could. Which is it?

> On May 1, 2020, at 1:22 PM, Geoff Huston <gih at apnic.net> wrote:
> 
> 
> 
>> On 2 May 2020, at 1:25 am, Dave Lawrence <tale at dd.org> wrote:
>> 
>> Geoff Huston writes:
>>> "Finally, many more resolvers today are capable of falling back to
>>> TCP when they receive a truncated response over UDP”
>>> 
>>> really? Where is the study that publishes this finding?
>> 
>> It could use clarification, certainly, beyond just the fuzziness of
>> "many more".  There are several metrics which could all claim to be
>> relevant.  A few of them seem like they are probably true in raw
>> numbers if only because of overall growth over the past couple of
>> decades (and yes, good measurement would confirm that).  Like:
>> 
>> * Total number of implementations
>> * Total number of running servers
>> * Total number of people served (not strictly a resolver, but still relevant)
>> 
>> But, maybe that picture changes when you ask about the percent of the
>> whole, and then "many more" might not apply.
>> 
>> Measurement rules, for sure.  I also don't think it is entirely out of
>> place to make a qualified claim based on our cumulative anecdotal
>> experience that overall the TCP fallback scenario is improved now vs
>> the past, as long as it clear that it is supposition rather than data.
>> 
> 
> My measurements of TCP use from time to time report that the relative number of
> users that sit behind recursive resolvers that cannot perform TCP appear
> to be unchanged for the 6 years that I’ve looked (from time tim time). Now
> there are many ways of reporting DNS (resolvers, users, queries, … as well as
> absolute numbers or relative numbers).
> 
> Therefore I don't understand the basis of the TCP claim in that report - it seems
> apocryphal to me
> 
> Geoff
> 
> 
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