We are planning to change our service providor and therefore will need
to change the public ip adress on our BM server. Is this a simple
matter of changing the address in INETCFG and telling our VPN clients
to access a different ip address or is there anything else I would
need to do.

Netware 6.5
Bordermanager 3.8 (http/ftp/dns proxy & C2S VPN)