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.