Ralf Weber wrote on 2019-12-03 14:21:
On 3 Dec 2019, at 3:15, Michael StJohns wrote:
...
The way I read this is that setting the bit simply because you
couldn't include diagnostic info is a no-no. Let's not do it.
I disagree. The EDNS0 OPT RRSet is needed and thus if can not be fitted
entirely a TC bit has to be set. Also 2181 was before EDNS0 so IMHO it
doesn’t apply here anyway. EDE is all is new stuff we have to decide
over what do with it now and not some ancient RFC. And a lot of people
(including me) have said that they, because of the rare cases this
appears, see TC as the right solution as it is simple and backwards
compatible. EDE already is complex we should not increase it complexity
for a rare corner case.
i think EDNS0 is no longer optional. if you can't speak it because of
response truncation problems, you set TC=1.
so, i am +1 to ralf's text above.
--
P Vixie
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