Functional requirement: Add parameter support to select nd address

[Sunser]

Advertise multiple prefixes on the router IPv6 interface, and the dhcpcd client will simultaneously add the broadcasted multiple prefixes to the interface I have multiple interfaces in Linux, and I just want to choose to add an address with a different prefix to each interface. Can we consider adding a parameter in the configuration file to allow the client to fix the address of nd1_addrX and add it to the interface. For example, adding a selectaddr 1 indicates adding the value of nd1_addr1 to the interface Another interface setting is selectaddr 2, which means adding the value of nd1_addr2 to the interface