NAC for VPN clients

Hi everyone,
does somebody knows how to configure a pix/asa and/or a router to do admission control for the vpn clients that connects?
Thanks

Hi,
These links will help :-
http://www.cisco.com/en/US/products/ps6121/products_configuration_guide_chapter09186a00806a81a0.html
Regards,
Vivek

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