In article <mailman.2135.1390499953.20661.bind-us...@lists.isc.org>, Blason R <blaso...@gmail.com> wrote:
> Perfect this is what I m thinking. So in some case I observed that > subdomain.example.com has ns record specified but no A record associated > with it. But if i do query set type=ns to parent ns record it shows > something else. > > Like > > Set typ=ns > Sybdom.example.com > > Ns5.example.com > > Set type=a > Ns5.example.com > No A record > > Server ns1.example.com > > Set type=ns > Subdom.example.com > Ns2.example.com > > Is this setup correct? Resolvers don't usually query for NS records explicitly. They query for the record that the client has requested (e.g. the A record for subdom.example.com). If the server they query doesn't have that record, it sends the NS records for a more specific subdomain in a referral. Then the resolver repeats the process using ne of those servers, and so on. When the resolver gets NS records in a referral, it may need to query for their A records in order to query them (sometimes these A records will be included as "glue" along with the referral). You can see this in action by using the +trace option to "dig". > On 23 Jan 2014 23:04, "Ben Croswell" <ben.crosw...@gmail.com> wrote: > > > A freshly started server with no cache will be directed to nd1 first which > > will give a referral to ns2 for the subdomain. After that it will go to ns2 > > directly until the ns records time out in cache. > > On Jan 23, 2014 12:30 PM, "Blason R" <blaso...@gmail.com> wrote: > > > >> Hello friends, > >> > >> I may sound like novice but have basic question regarding Sub-zone which > >> is an delegated zone. lets say I have zone example.com whose NS are > >> ns1.example.com and then I have delegated sub-zone subdom.example.comwhose > >> ns record would be say > >> ns2.example.com. > >> > >> So people who will be querying to A record for subdom.example.com [which > >> @] will first be forwarded to ns1.example.com and then from there ns > >> record of subdom.example.com will be given? > >> > >> Or will it directly be forwarded to n2.example.com? > >> > >> _______________________________________________ > >> Please visit https://lists.isc.org/mailman/listinfo/bind-users to > >> unsubscribe from this list > >> > >> bind-users mailing list > >> bind-users@lists.isc.org > >> https://lists.isc.org/mailman/listinfo/bind-users > >> > > -- Barry Margolin Arlington, MA _______________________________________________ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users