We have just migrated all the roles to the new DC 2012 . I noticed that when i shutdown 2008 DC ,my internet get really very slow and the minute it get back ,internet gets normal .
This is not happening if i also shutdown my proxy server which was setup by the previous manager when we were using 2008 DC. So something is there within proxy server that causing this issue.
We are using Squid proxy server on the open source and i have less knowledge about it . Can someone please guide me what setting's or what's in here that is causing the dns resolve or internet slow issue