BIND to give different response for different AS/source IP

[Jacek Skaźnik]

Hi,

In my company we have 2 FR links to different ISPs, but we're unable to 
get BGP. As far as we know our local customers (let's say from 30 or so 
ASes) get better response time (ping, hops) via Link1, but all the 
others get better response via Link2. Is there a way to configure Bind 
to respond one IP for some AS/source ip address and different IP for 
another source AS/IP address? It would be just like round-robin in a 
way, but should check in some external DB/file which IP address should 
be resolved from a domain name for particular source.

Thanks for help,
Jacek