VPN concentrator and reserve ip address based on MAC address

I have got Cisco VPN concentrator 3000 at work , it is working fine.

I have got mobile PC (with Cisco PC client ) that is looking to access its correspondent server in the DMZ area (192.168.101.204) at work 's network, through VPN concentrator.

How can i reserver an internal ip for that mobile PC based on its MAC address,,,the reason I am doing that to reserve the specific private ip address for that mobile PC

We use safeword Token for authentication

How can I configure that on VPN ?

On PIX, I have got no problem to configure ACL from inside to DMZ.

Don't know the answer to that, just curious why you cannot assign the IP Based on the User Authentication ?

just curious why you cannot assign the IP Based on the User Authentication ?

How can I do that ? I will try it and see how it is going