Multisite IP address management

Hi,

I have a multisite installation with many sites using domain mapping. I have configured several shared IP addresses for this installation. However, if you access any of the IP addresses they always redirect to site 1 home page.

Is there a way to manage the IP addresses so that I can control where each shared IP address would re-direct if it is accessed directly?

Currently:

Shared IP 1 -> Site 1
Shared IP 2 -> Site 1
Shared IP 3 -> Site 1

What I would like to achieve:

Shared IP 1 -> Site 1
Shared IP 2 -> Site 2
Shared IP 3 -> Site 3

Thanks,
Pat