Question on delegation and recursion

[Kevin Darcy]

Ted Hajduk wrote:

> Long time reader and 1st time poster - please be gentle.
>
> I'm trying to understand the following internal DNS scenario and I
> could use some help.
>
> Three DNS servers - all are doing recursion
>
> 1) DNS1 is primary master for zone B.C and has delegated zone A.B.C to
> DNS2 (but it is not a slave for A.B.C - so no zone xfer)
>
> 2) DNS2 is primary master for zone A.B.C
>
> 3) DNS3 is slave for zone B.C only - and therefore gets a zone xfer
> from DNS1 for B.C
>
> Question: If a user sends a DNS request for A.B.C to DNS3, will it be
> resolved?

If it supports recursion, sure. It'll use the delegation information to
find the authoritative nameservers for A.B.C, ask them the query, and
pass the response back to the user.

If it doesn't support recursion, it'll just return a referral for A.B.C.


- Kevin