VPN - reserving Pool addresses

[vitumbiko nkhwazi]

  Hello there.

I have created a PPTP VPN on a cisco  3745 router, and a pool of addresses for the VPN clients. Now i want to find a way to reserve the addresses in the pool for specific machines,  for example,  if machine A connects to the VPN it should always be given the IP address a.a.a.a and that address should never be assigned to any other machine even if machine A is not connected to the VPN. Please help.

Thanks.

[Jitendra Siyag]

you can reserve the ip address for a particular user in the ACS. and you will have to authenticate for vpn via ACS. i have done this and it works perfectly.