Patent ID: 11509686

Abstract:
In an embodiment, a computer-implemented method for DHCP-communications monitoring by a network controller in software defined networks is disclosed. A method comprises detecting that a virtualized compute instance is instantiated on a host computer; generating, and transmitting to a port manager executing on the host computer, instructions to set a BLOCK-EXCEPT-DHCP status on a port assigned to the virtualized compute instance; determining whether an IP address has been assigned to the port by a DHCP service; and if it has: generating, and transmitting to the port manager, instructions to set a NORMAL status on the port; generating, and transmitting to the port manager, a SpoofGuard configured with the IP address assigned to the port; based on notifications received from the SpoofGuard, determining whether the IP address assigned to the port of the virtualized compute instance has been misused, expired or spoofed; and if it has, transmitting instructions to set the BLOCK-EXCEPT-DHCP status on the port.