NAC Appliance. Does it add any security to the network?
I currently don't have the Clean Access in hands, but, so far as I understood, the user can disable required antivirus or enable bittorent (or other prohibited application) at any time and this action will not be noticed by the Clean Access Agent and Clean Access Server. This is because this Cisco "security solution" doesn't support periodic reassessment of clients (neither Agent-initiated nor CAS-initiated).
Is this correct?
(BTW the NAC Framework architecture supports this).
The only option I've found is to periodically clear Certified Device List using timers. But this will end the user session too! Both, good guys (who still meet all our requirements), and bad guys (who now violate our security policy) will have to reauthenticate, because this "feature" doesn't differentiate between them!
Also, this will likely break OOB. It will either bounce the switch port, if port bouncing is enabled, or put the port back into the authentication VLAN with IP address in the access VLAN, which is incorrect for the authentication VLAN (has it been fixed by Cisco?)!
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...