unable to block proxy, proxy shield and VPN app

Hi Experts
i am working with ISA 2006 and TMG 2010
i Block facebook and Youtube etc for all users except Managers :)
my issue that some users working on they own laptop out of AD environment so they have ability to change DNS ip
and setup VPN and Proxy app to bypass the firewall rules
any idea
MASWORLDAsked:
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David Johnson, CD, MVPOwnerCommented:
don't allow unmanaged machines on your network..  Which sort of breaks the BYOD that is popular.  you can block ip's at the router.
MASWORLDAuthor Commented:
@David Thanks
i agree with you but some times i compelled to allow those Devices to access the internet for mail, Shared printers etc
David Johnson, CD, MVPOwnerCommented:
you can try blocking facebooks ip addresses at your router or use an ASA or other hardware to block facebook.

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Benjamin Van DitmarsSr Network EngineerCommented:
are the byod devices on the same subnet or you have some guest network ?
MASWORLDAuthor Commented:
Yes in the Same Subnet
David Johnson, CD, MVPOwnerCommented:
you could always use software like net nanny http://www.netnanny.com/
MASWORLDAuthor Commented:
Thanks David
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