What are a zone's NS records used for?
Answered Sun, 26 May 2002
> Could you elaborate a little bit on why do we need to put NS records for
> the zone we are authoritative for ?
> The parent name server handles these already. Is there any problem if our
> own NS records have lower TTLs than the records from parent name server ?
That's a good question. The NS records from your zone data file are used for several things:
- Your name servers returns them in responses to queries, in the authority section of the DNS message. Moreover, the set of NS records that comes directly from your name server supersedes the set that a querier gets from your parent zone's name servers, so if the two sets are different, yours "wins."
- Your name servers use the NS records to determine where to send NOTIFY messages.
- Dynamic updaters determine where to send updates using the NS records, which they often get from the authoritative name servers.
cricket
