NS records and serial numbers

[Len Conrad]

>- If a domain name has 3 nameservers

3 delegated nameservers?

>, does the zonefile *have* to=20
>have all 3 listed as:
>IN NS ns1.
>IN NS ns2.
>IN NS ns3.

yes, if they are all delegated.

"delegation (NS) data and zone (NS) data must match"

>I ask because some of our zonefiles on some nameservers do not=20
>list all 3 (We added a 3rd nameserver but some old records did not=20
>get updated). What problems could this cause?

queriers obtain the list of delegated NSs from the NSs authoritative for 
your zones's parent zone (ie, they don't quert your NS for your NS 
records).  but perfect NS records are always best practice

>- If using 3 master nameservers for 1 domain, does the serial=20
>number have to be the same on all 3 nameservers

yes.

Len


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