Hey Michael, I will get it changed. We should not count unauthenticated users against the license. Doesn't make sense to me.
Thanks -alok -----Original Message----- From: Cisco Clean Access Users and Administrators [mailto:[email protected]] On Behalf Of Michael Grinnell Sent: Thursday, February 19, 2009 3:29 PM To: [email protected] Subject: Re: Session Timer How exactly would you do that? Turn off the wired port? Disassociate them from the AP? I'm not sure this is a problem that CCA can solve. I think you're best solution to prevent this is at the authentication provider, where you can lock the account after a certain number of attempts, or throttle repeat authentication attempts for the same account. Personally, I am more concerned that Cisco has said that unauthenticated users will count against your license, so if you have an open AP, or wired ports in an open area, you could be subjected to what is effectively a denial of service attack of too many unauthenticated computers at one time. I haven't played with it yet, but it's possible that an ARP spoofing program could also accomplish the same result, at least for in-band. Michael Grinnell Information Security Engineer The American University Don Click wrote: > Interesting. I don't think Clean Access would have helped much anyway - since it would have quarantined the user on wireless, not wired. > > I agree that if a user is associated to an AP, but not attempting to Authenticate, there should be some mechanism either in the AP's (not likely) or in CCA that, after a period of time, drops/blocks/moves the user. > > Im actually going to have to think about this one, as I am about to start looking at configured our CCA solution for OOB Wireless/Wired. (currently, we use in-band for VPN access only.) > > From: Cisco Clean Access Users and Administrators [mailto:[email protected]] On Behalf Of Speight, Howard > Sent: Thursday, February 19, 2009 8:24 AM > To: [email protected] > Subject: Re: Session Timer > >> Question - Are you using clean access for both WIRED and Wireless? > Only in the Residence Halls > >> If its only on wireless, what security to you enforce on the wired lan? > Group policy and logon scripts for Domain machines, filters on router and switch interfaces. > > > From: Cisco Clean Access Users and Administrators [mailto:[email protected]] On Behalf Of Speight, Howard > Sent: Wednesday, February 18, 2009 2:36 PM > To: [email protected] > Subject: Re: Session Timer > > That makes sense, then there is no reason to set that timer... > > Food for thought... > > We had an unauthenticated client machine on the wireless network, using wired, but associated with an AP and holding a DHCP IP address. For hours that machine was conducting little raids here and there trying to compromise user accounts. Once blocked in the Filters, activity ceased. What I was trying to accomplish was if the client machine was holding an IP but not authenticating, I wanted to send them to Quarantine or anywhere after ten minutes. How were they able to conduct the raids, the authentication ports are open to the AD controllers in the Unauthenticated Role... > > From: Cisco Clean Access Users and Administrators [mailto:[email protected]] On Behalf Of Jim Thomas > Sent: Wednesday, February 18, 2009 14:20 > To: [email protected] > Subject: Re: Session Timer > > > Unauthenticated Role, it's a loop and es no bueno. > > > Thanks > Jim > > Jim Thomas > Area Networks, Inc. > CCIE Security #16674 > CCSP,CCNP,CCDP > [cid:[email protected]] [email protected]<mailto:[email protected]> > [cid:[email protected]] Office: 650-242-8050 > [cid:[email protected]] Cell: 916-342-2265 > [cid:[email protected]] > [cid:[email protected]][cid:[email protected]] > > > > -----Original Message----- > From: Cisco Clean Access Users and Administrators [mailto:[email protected]] On Behalf Of Speight, Howard > Sent: Wednesday, February 18, 2009 1:38 PM > To: [email protected] > Subject: Session Timer > > > > Let's say the Session Timer is set for ten minutes on the Unauthenticated Role and the user does not authenticate within that ten minute period, where does the user go? > > > > Thanks, Howard >
