> There's an easy way which I think is a clear optimization: > When there is a cache miss, before recursing, search the cache for a > parent NXDOMAIN entry. If you find one, add an NXDOMAIN cache entry for > the QNAME, and return that, otherwise recurse as usual.
I don't see a problem with this, but I also don't see any argument for making a normative requirement to implement it. Do you? _______________________________________________ DNSOP mailing list DNSOP@ietf.org https://www.ietf.org/mailman/listinfo/dnsop
