[dns-operations] Caching of wildcards

Florian Weimer fweimer at bfk.de
Wed May 11 09:21:14 UTC 2011

* Jeff Chan:

> If a zone has wildcards:
> *.foo.com
> does the nameserver cache grow with each different query:
> a.foo.com
> b.foo.com
> c.foo.com
> or not?

Each record is stored separately.  There might be some sharing of name
suffixes, but it won't result in huge savings.

DNSSEC provides data for more efficient caching, but to my knowledge, no
one implements that (the standard suggests not to do this, too).

Florian Weimer                <fweimer at bfk.de>
BFK edv-consulting GmbH       http://www.bfk.de/
Kriegsstraße 100              tel: +49-721-96201-1
D-76133 Karlsruhe             fax: +49-721-96201-99

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