Another possibly-crazy thought ...

Should BULK be allocated from the metatype range, 128-255? The idea being
that this would cause the zone xfer to be rejected by servers that don't
understand it.

... but, from looking at BIND's code (I didn't test it) I think this idea
wouldn't actually work in practice because BIND only rejects xfers
containing explicitly-known metatypes - it treats most of 128-255 as
unknown.

Tony.
-- 
f.anthony.n.finch  <d...@dotat.at>  http://dotat.at/  -  I xn--zr8h punycode
Southeast Viking, North Utsire, South Utsire: Cyclonic 4 or 5, becoming
southeasterly 5 to 7, perhaps gale 8 later. Moderate or rough. Rain later.
Good, becoming moderate or poor later.

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