Thisis my first post so for if there is any mistake.
One domain ( One forest) and multisite.
in each site we have a DC on windows 2008 and Virtual machine with Webwasher (linux) installed.
A proxy.pac script are deployed with GPO to all users :URL is like : http://proxy-Paris/proxy/proxy.pac.
(the proxy-paris is server in central site : Paris) , the problem is that the users are compliant that the internet is very slow.
how the dns should be configuredt ?