Cache only and reverse mapping

[/dev/rob0]

On Thursday 15 December 2011 02:07:12 sasa sasa wrote:
> For an ISP, is there any risk in configuring BIND DNS as cache
> only and adding customer's reverse mapping zones? Any other
> possible implementations?

To be precise, when you are serving any zones authoritatively, your 
server is no longer "cache only".

There is no difference between in-addr.arpa zones and other zones, as 
far as named/DNS is concerned. If you have been delegated reverse DNS 
for your [customer's] netblocks, you do indeed need to serve those
in-addr.arpa zones.

I am not sure what you are asking regarding "risk" and other 
implementations.
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