Help: Return different IP address based on source IP

[D. J. Bernstein]

Dr Yufan Hu writes:
> More general, is it possible to return different IP address for a name
> based on the source IP address of the query?

The DNScache package includes a client-differentiating server, pickdns.
http://cr.yp.to/dnscache/faq/pickdns.html#differentiation

You can use pickdns without upgrading everything to DNScache: simply run
pickdns on another IP address and delegate www.foo.com to it.

---Dan