Network

Open the machine → Network tab.

• Floating IPs — the public IPs routed here. A floating IP belongs to your organization, so you can move it between machines; the primary IP can't be removed. Add one with Add IP (same location only).
• rDNS — set a PTR record per IP inline; important for outbound mail.
• Private network — attach the machine to a VPC for internal traffic: pick a network in the same location and Attach.

Note: After changing IPs or the private network, restart the machine to apply.