The byzantine convolutions of RFC 2317-style delegation

[Jonathan de Boyne Pollard]

SH> In the zone 12.12.12.in-addr.arpa, there must be a pointer which
SH> delegates the record to your nameserver :
SH> 128	PTR	128.128-255.12.12.12.in-addr.arpa.

No.  In RFC 2317-style delegation there should be a *client-side alias* 
that re-maps the original name to one with the extra "128-255" label in 
it, and a *delegation* of "128-255.12.12.12.in-addr.arpa.".  A "PTR" 
resource record is exactly what there *shouldn't* be.

SH> There is actually an RFC for doing just this, but it's number 
escapes me.

That's probably a good thing.  You should thank your lucky stars.  (-:

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