Is IPv6 Compatible with IPv4?
IPv6 and IPv4 are two completely separate protocols. IPv6 is not compatible with IPv4, such that IPv4 hosts and routers will not be able to communicate directly with IPv6 end point (and vice versa). However, there are transition technologies that support the coexistence of IPv4 and IPv6, such as tunneling IPv6 in IPv4 and dual-stack, which runs IPv4 and IPv6 over the same physical interface.