* Masataka Ohta:

> The fix is, again, that, if you are told that NS for www.example1.com
> is ns.example2.com with glue-A of ns.example2.com is, the
> glue-A must be cached with a tag that the information is valid only
> as NS of www.example1.com.

Or you cache referrals without storing any name server name.
Conceptually, this seems to be the much simpler approach.

Florian Weimer
BFK edv-consulting GmbH http://www.bfk.de/
Kriegsstra=DFe 100 tel: +49-721-96201-1
D-76133 Karlsruhe fax: +49-721-96201-99

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