Cache only and reverse mapping

[Kevin Darcy]

On 12/16/2011 11:22 AM, sasa sasa wrote:
> I'm trying to setup a DNS for an ISP, this ISP's DNS is in delegation tree (answering world), and I know about cache vulnerabilities so I was wondering what is the best solution for ISPs?
> By separating cache from authorities, you mean implementing 2 DNSs (2 different IPs)? This doesn't sound practical.
>
Wait, it's not "practical" for an ISP to serve different logical 
functions on different IP addresses?

What kind of ISP is this?

                                                                         
                                 - Kevin