[dns-operations] TTL=0

[Andrew Sullivan]

Seems to me RFC2181 already answered this years ago.
-- 
Andrew Sullivan
Please excuse my clumbsy thums.

On January 18, 2019 17:21:40 Greg Choules <gregchoules at googlemail.com> wrote:
> Hi Fred.
> No, I am not talking about dscacheutil or any particular client software. I 
> just want to know whether, in the opinion of the world's DNS professionals, 
> recursive servers should or shouldn't ever send answers from cache with TTL=0.
>
> cheers, Greg
>
> On Thu, 17 Jan 2019 at 23:15, m3047 <m3047 at m3047.net> wrote:
> Who cares about the RFC? In practice, SOME caching resolvers (and that's
> being charitable) WILL answer with TTL=0. I've had to live with PFSense
> deployments which did this.
>
> Which in turn leads to things like (for Mac users):
>
> dscacheutil -flushcache
>
> Is that what you're talking about?
>
> On Thu, 17 Jan 2019, Greg Choules wrote:
>> [...]
>>
>> Is there ever a case, for cached answers, that the recursive server would
>> answer the client with TTL=0? Or would that be illegal? RFC1034 states that
>> records with TTL=0 "should not be cached". Note "should" and not "must".
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