call webservices in a farm scenario

[Fabio R.]

To support a webfarm scenario, I'd like to use a webservice to update/delete
cache objects.
I have in my web.config the list of the local servers (192.168.0.1,
192.168.0.2, ...) and when I need to delete a cache object the webapp calls
http://192.168.0.1/webservice.asmx
http://192.168.0.2/webservice.asmx.
ecc..
It works fine because http://192.168.1.x is the default website and I can
reach the right webservice's path.
Now the problem is: what about hosting more than a single website in the
farm?
If I have www.site.com (as the default website) and www.site2.com, how can
I call the equivalent of www.site2.com/webservice.asmx in every server of
the webfarm?
I'm not an expert so any help will be very very useful.
Thanks,
Fabio