I did some searching on the ML archives and didn’t see what I’m trying to ask.

Is there anything (i.e. a config knob) in any current version of BIND that 
allows one to control this ?

My understanding is that on (around ?) the DNS Flag Day of 2/1/19 - BIND won’t 
retry (with EDNS disabled) non-answered EDNS queries - rather it will consider 
them failures ?

I see that as of now there is this knob:

server a.b.c.d {
    edns no;

But I’m talking about the behavior described in the DNS Flag day materials.  Is 
that simply going to be changed in code sometime around/on 2/1/19 ?

Brandon Applegate - CCIE 10273
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"For thousands of years men dreamed of pacts with demons.
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