VPN

Hello all.  I am using the Shrew Soft VPN client to establish a remote IPSEC VPN session to my office.  This is working properly, but I was wondering if there is a way to assign an IP address to the connecting client depending upon the contents of the connection's certificate?  I can manually assign an address via the Shrew Soft VPN client, but this could easily be modified by any of the remote users.

Any ideas regarding this are greatly appreciated.

Thanks.

Vincent