No. Networks can migrate to IPv6 gradually, using transition
mechanisms defined by IPv6 Protocol Specifications. IPv4 and IPv6
will coexist for a long time. IPv6 Protocol Specifications provide
two major transition mechanisms:
Dual Stack: Dual-stack hosts have both IPv4 and IPv6 interfaces
configured and can communicate with both IPv4 and IPv6 hosts.
Tunneling: Tunneling is a mechanism that has been defined
to allow IPv6 packets to be encapsulated in IPv4 packets. A Dual-Stack
host can send IPv6 packets through an IPv4 tunnel to a remote IPv6
host, without requiring an IPv6 infrastructure.
