On Apr 7, 2022, at 21:10, Paul Vixie <[email protected]> wrote:

> but it seems to me you'd be better off with a zero-length option called 
> SERIAL which if set in the query causes the SOA of the answer's zone to be 
> added to the authority section (similar to an RFC 2308 negative proof) and 
> which option would only be echoed in the answer's OPT if the option was 
> supported. you'd want to specify that the SOA in this case is not optional 
> and that its truncation would cause the TC bit to be set.

That sounds like a lovely and clean way to do this. I like it. 


Joe
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