Cisco 3000 Concentrator - security question

Unanswered Question
Feb 8th, 2007

Is there a way to specify which computers can be allowed a full authentication process to a corporation that deploys/deployed a vpn 3000 concentrator?


7 laptops. Each one of the seven is given to a different employee. They each have their own login/password, and utilize the PCF file that none of them really know about, but nothing will stop them from finding it if they are curious.

To prevent the transference of PCF file, and a login/password from one employee to someone on the outside, from being utilized on their own desktop/laptop, can the 3000 concentrator employ any type of mac-filter based queries so unauthorized computers can't fully authenticate on to the network.


I have this problem too.
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ryanwesteagle Fri, 02/09/2007 - 09:07

Well, implementing NAC takes alot of modifications to various devices to get the nac frame-work in place. I was looking for any type of out of the box configuration changes that could allow target boxes yes or no connection.

Im starting to think , seperate device or device(s) would be necessary. A low cost solution to addressing this concern.

ryanwesteagle Mon, 02/12/2007 - 06:52

Mac filtering works on a different layer in OSI then the layer the concentrator works at.

I did a little further investigations, and had some help from others that mentioned this type of functionality we desire, all though it is a good security concious thoguht/need/desire, not even the asa's do this.

Can anyone from cisco address the original question? The cheapest method to implement. So rogue pc's can't utilize an imported pcf, and a users creds, because corporate maintains a list of acceptable macs.

ryanwesteagle Tue, 02/13/2007 - 13:56

I'll try to get in contact with a few people.

Some have said, if we have this fear about an employee, then simply revoke their access. Well the approach/thought that was given to me, was to make it happen. Technologically, it is possible, but how?

Im rather curious as to why cisco doesn't have this as a feature on asa's, or concentrator's, or pix's when it comes to software client vpn connections that authenticate with a username and password.

Can not one representative at cisco help out here? My next avenue to find out, will be to email a regional account rep that maybe could point me in the right direction, but I don't want to hassle him at the present.

rscarbsds Thu, 02/22/2007 - 10:34

First off let me say that a user cannot just download a VPN client from Cisco. You must have a valid Cisco account. Next the user must have the proper credentials applied to the VPN client , i.e. Group authentication including username and password, and then if they somehow compromise this information they must be authenticated via Radius, AD, or however your concentrator is configured. We have 8 of these boxes, (4) 3005's and (4) 3015's and I find them very user friendly to configure and administrate.

I hope this helps ......

ryanwesteagle Thu, 02/22/2007 - 10:56


the jist of our issue is, we want to limit the hosts to corporate laptops only.

So if a malicious employee gives their PCF file(if they know about it, and where it resides), and their concentrator username/password, it will be null, because any other computer except for the corporate laptop will not be allowed onto the network. If mac adresses can be integrated into the authentication process through whatever method cisco could implement this, this would make security "that much better".



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