Duplicate address detection for ranges of global IP addresses

A host network device comprising:

• a network interface implemented in circuitry;
• and
• one or more processors implemented in circuitry and configured to:
• receive a first message according to Duplicate Address Detection Protocol (DAD) from a first local network device, the first message including data indicating that the first message includes a first range of global Internet protocol (IP) addresses, the data further indicating a first ordinal first global IP address in the first range and a first range value;
• determine that at least one global IP address in the first range of global IP addresses starting with the first ordinal first global IP address and through the first range value is reserved by the host network device;
• send, via the network interface, a response message representative of the at least one global IP address;
• receive a second message according to DAD from a second local network device, the second message including data indicating that the second message includes a second range of global IP addresses, the data further indicating a second ordinal first global IP address in the second range and a second range value;
• determine that no global IP addresses in the second range of global IP addresses are reserved by the host network device;
• and
• in response to determining that no global IP addresses in the second range of global IP addresses are reserved by the host network device, ignore the second message.

A non-transitory computer-readable storage medium having stored thereon instructions that, when executed, cause a processor of a host network device to:

• receive a first message according to Duplicate Address Detection Protocol (DAD) from a first local network device, the first message including data indicating that the first message includes a first range of global Internet protocol (IP) addresses, the data further indicating a first ordinal first global IP address in the first range and a first range value;
• determine that at least one global IP address in the first range of global IP addresses starting with the first ordinal first global IP address and through the first range value is reserved by the host network device;
• send a response message representative of the at least one global IP address;
• receive a second message according to DAD from a second local network device, the second message including data indicating that the second message includes a second range of global IP addresses, the data further indicating a second ordinal first global IP address in the second range and a second range value;
• determine that no global IP addresses in the second range of global IP addresses are reserved by the host network device;
• and
• in response to determining that no global IP addresses in the second range of global IP addresses are reserved by the host network device, ignore the second message.