Specify the allowed methods for address binding in Neighbor Binding Table.
autoconfig(1) refers to stateless address autoconfiguration.
autoconfigAndManual(3) allows manual and stateless address autoconfiguration.
dhcp(4) permits binding only from DHCP.
autoconfigAndDhcp(5) binds from DHCP and stateless address autoconfiguration.
autoconfigManualAndDhcp(7) binds from Manual, DHCP and stateless address autoconfiguration.