How can I prevent link local address In NDP Package NS in purpose of Neighbour Reachability

As I assigned static IP using ip -6 addr add dev eth0.4 My system is connected with other system by eth cable in same network by ethernet adapter configuration Now I am pinging my other pc,I observed Pc is using assing ipv6 address as a source for address resolution For neighbour reachability it's using link local address as a source I want like for neighbour reachability it should use assing ipv6 address.