Help: Return different IP address based on source IP

[Kevin Darcy]

Dr Yufan Hu wrote:

> Hello,
>
> I have a wired situation I would like to seek advice.
>
> We have a web server running at www.foo.com and we have a very large group
> of potential users that are behind somebody's firewall. We can however
> setup a host within that firewall to do http forwarding for all these
> users through a host named as fwd.foo.com. Due to marketing reason I do
> not want these users to use the name fwd.foo.com instead of www.foo.com.
> The simplest way of doing this is to return the address for fwd.foo.com
> when the name server for these group of users query our name server for
> www.foo.com.
>
> I think the easiest way is to set up a secondary on these firewall DNS
> servers to use different master data. However, due to some political
> reason the server admin refuses to provide such service to us (although
> the network owner allow us to setup a host inside the firewall).
>
> My question is: is it possible, in Bind 8 or with some assistant tools, to
> detect that the query comes from the DNS serving the users behind the
> firewall and return IP address for fwd.foo.com for queries for www.foo.com?
> More general, is it possible to return different IP address for a name
> based on the source IP address of the query?

Check out the "sortlist" option.


- Kevin