Our workstations clients currently have cached IP's for their POA. When we move to the cluster and setup a virtual server with a new ip how will the clients connect to the POA.
Should I send out a registry key update ahead of time to point them to
ngwnameserver? That way when we switch to the virtual IP the client will
pickup the new location via our DNS entry for ngwnameserver?

The enviroment we be the following:
server 1 - 2 Post offices (client server ports 1677 & 1678)
server 2 - 2 Post offices (client server ports 1679 & 1680)

Does ngwnameserver only search on port 1677?
How will the client know to go to the new ip if the ip is cached in their workstation?