RAS Configureation

RAS installed on BDC that runs NT 4.0 with
SP 6a

The RAA already has a STATIC ADDRESS POOL with few VPN connections.

Now I need to delete this IP POOL and create a new IP POOL. This is my first time to configure RAS. If I go into RAS server TCP/IP
TAB and change the ip pool, will this change cause any functional problems and other problem to the RAS server services? Since the Routing and RAS service already has its old configuration, will this change in IP pool cause the existing VPN configuration drop.

What is the best and safe way to change a new IP pool for RAS server?

Thanks in advance for any recommendations and solutions