4507R+E will let clients communicate, but if someone needs to renew their lease on DHCP, it will not renew the IP.  All other clients in other areas/switches/subnets are using DHCP with no problem. The configuration I've seen that appears "flaky" is...

I have some clients that are permanently remote.  I want their laptop to log into ASA VPN using machine authentication without the user, base on a scheduled task that I will create.   Is this possible?