Blocking Windows

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I have some users who dual-boot, Linux and Windows (a variety of
versions).  Rather than keep up with ALL the Windows security holes, I
would like to be able to block access to computers on the LAN if the
OS is Windows (or, not Linux).  Obviously, I can't do it by MAC
address, since the cards are the same.  I could set them up with a
different manual IP block, but they could change their IP numbers.

Is there a fairly simple way to detect a Windows client?  It doesn't
have to be 100% sure.  Any hints or pointers to docs would be
appeciated.

Thanks.

-- 
Jan Wilson, SysAdmin     _/*];          corocom@xxxxxxx
Corozal Junior College   |  |:'  corozal.com corozal.bz
Corozal Town, Belize     |  /'  chetumal.com & linux.bz
Reg. Linux user #151611  |_/   Network, PHP, Perl, HTML



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