This read-only IpAddress attribute specifies a target IP address that has been reserved on this Ethernet port such that no ComPort is permitted to use it in an ARP response. It lets an administrator protect infrastructure addresses, like the CC's own management IP, from being spoofed by a subscriber cable modem. For example, an operator would add the headend's management gateway address here to prevent a misconfigured or malicious ComPort from claiming it via ARP.