On Wed, Mar 26, 2014 at 08:22:03PM +0800, 刘明星 <[email protected]> wrote a message of 59 lines which said:
> if a recursor ask a tld server for A records of a domain name, > such as a.test.tld, the .tld server return a nxdomain response to > the recursor. Only if test.tld does not exist. > In this case, the recusor does not know whether there are other > domain names related to test.tld, like b.a.test.tld, That's not true. If the TLD server returned NXDOMAIN for the query a.test.tld, the recursor can be sure b.a.test.tld does not exist either. > b.test.cn and c.b.test.cn, [I assume you mean b.test.tld and c.b.test.tld] It is a bit more complicated because it depends whether the TLD server is also authoritative for test.tld or not. _______________________________________________ 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
