what types of authoritative data are they in .de zone? For what? Does it comply with dns standards?
2014-03-26 22:13 GMT+08:00 Peter Koch <[email protected]>: > On Wed, Mar 26, 2014 at 08:22:03PM +0800, ?????? wrote: > > > this case, the recusor does not know whether there are other domain names > > related to test.tld, like b.a.test.tld, b.test.cn and c.b.test.cn, so > that > > next time it should query the tld again when it receives queries for such > > domain names. Consequencely, If a ddos flood of random third-level domain > > names hits the recusors, the flood also be redirected to the the tld the > > domain names belong to. > > this sounds like an attempt to extend the resolver's negative caching > in a way that sometimes has been called "aggressive negative caching". > > > I want to know whether there other types of data except delegation > data. > > DE definitely has authoritative data in the TLD zone itself, at the second > and deeper levels, including "empty non terminals". For a remotely > related discussion, you may want to look for "delegation only" in the > BIND archives. > > > If there are only delegation data in tld some servers , the recursors > > should send less unnessary queries to tld servers when they receive a > large > > of queries for a random third-level domain names. As a result, the tld > > servers escape from the disasters. > > While that's a laudable goal, basing the resolvers' behaviour on > assumptions > made about particular zones in the tree makes me a bit nervous. In your > example > above, you could ask for the delegation for "test.cn" explicitly, but > that's > already a questionable deviation from protocol reality (Stephane's draft > "draft-bortzmeyer-dns-qname-minimisation-01.txt" nonwithstanding). > > -Peter > > -- > Peter Koch | | [email protected] > DENIC eG | | +49 69 27235-0 > Kaiserstraße 75-77 | | > 60329 Frankfurt am Main | | http://www.DENIC.DE > ------------------------------------------------------------------------- > Eingetr. Nr. 770 im Genossenschaftsregister Amtsgericht Frankfurt am Main > Vorstand: Helga Krüger, Carsten Schiefner, Dr. Jörg Schweiger > Vorsitzender des Aufsichtsrats: Thomas Keller >
_______________________________________________ dns-operations mailing list [email protected] https://lists.dns-oarc.net/mailman/listinfo/dns-operations dns-jobs mailing list https://lists.dns-oarc.net/mailman/listinfo/dns-jobs
