On Fri, Jul 03, 2020 at 09:19:48PM -0400, John R Levine wrote: > > Uh, no. The TC flag means "something didn't fit". > > It is not restricted to glue, which is only in the additional section. > > TC can also be set if something from the authority section didn't fit, or > > if something didn't fit in the answer section. > > (Obviously it would be the first section where something didn't fit that > > matters.) > > Well there's a question. Is there any DNS software that will keeps adding > new sections to a truncated answer, e.g., a partial authority section but it > has some additional records anyway. Seems unlikely but I honestly don't > know.
Pedantically, yes. OPT and TSIG RRs are added by some implementations
when TC=1, and they may delete answer and authority sections (fully or
in part) if necessary to make room for OPT and TSIG.
> In any event this whols plan still seems way overcomplicated. In my simple
> world, you can tell that an answer is a referral because it has an empty
> answer section and an non-empty authority section. A useful referral has some
> NS records in the authority section.
The DNS protocol seems to have jumped the shark. It's becoming more and
more of a rat's nest.
Mukund
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