Determine MAC address via Cisco ASDM

Hello,
I am trying to figure out how to block access from a certain remote computer to our network. The client computer sometimes connects via the VPN and sometimes only through Outlook RPC/HTTP.
The user still needs to connect to our network but I only want them to connect through a standard company issued computer they already have, not a personal one.
I tried to find the MAC address on the ASA 5520 using ASDM 6.1 when the client has an open VPN session but it seems that information is not available.
Any other way I can block access to our network from non acceptable computers?
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tolinromeAsked:
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lrmooreCommented:
you should consider using SSL based VPN like AnyConnect.
SSL vpn lets you extend the features using Secure Desktop. You can not only ask for a username/password, but you can also interrogate the PC. Are you one of ours? Do you have AntiVirus? Is it one of these versions? Has it been updated within past 72 hours?
You can get crazy with the interrogation, or just a simple test to make sure it is a company laptop, and if not, it can only access certain things. To know if it is one of yours, you can look for a specific file in a specific location, or a specific registry key, among other options.
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pablomoralesCommented:
You will not be able to get his MAC address unless he is connected directly to your network. If he is connecting from the internet then you will only see packets with the MAC address of your router.

To prevent your users from using unauthorized computers via VPN you only need to change the group password and don't give it to them. If you keep the group password secret then the users will not be able to setup the client on another machine without autorization. For Outlook RPC/HTTP you will have a harder time preventing the user from connecting using other computers so you may want to force the user to connect to his email account using the VPN and block his account from using Outlook RPC/HTTP.
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