How can I change the server IP NPM sees?

I am currently monitoring a VM host in my environment, and I'm working through managing the servers under that host. Several of the servers have 2 IP addresses: 1)  internal network connectivity 2) Something else in a different vlan.

When I'm looking at my host and seeing the details of the servers that reside on it, a few of these servers are showing as associating with the #2 ip address. When I click "Manage" it tries to add the Node using the wrong IP.

My question is, how do I change the IP that NPM is associating to that server?

Thanks.