Usually, IPv4 communication uses the IPv4 protocol stack, and IPv6 communication uses the IPv6 protocol stack. Whether to use IPv4 or IPv6 is based on the response to Domain Name System (DNS) requests, but usually, IPv6 protocol stack will be be given priority over IPv4. As dual stack allows hosts to simultaneously reach existing IPv4 and IPv6

IPv4 to IPv6 transition - Dual Stack - YouTube Jan 19, 2019 [REQ-385] IPv4/IPv6 dual stack support in ONAP - ONAP An enabler for IPv4/IPv6 networking would be an upgrade of ONAP OOM Helm charts to K8S 1.16+ APIs. The support for IPv4/IPv6 dual stack networking is planned to be executed in (at least) two-three steps: Migrate ONAP OOM Helm charts to support Kubernetes 1.17+ interfaces. Migrating From IPv4 to IPv6: What You Need to Know

Using IPv4/IPv6 dual stack, the BNG can provide both IPv4 and IPv6 services over the access network to the subscriber LAN. A single interface can operate simultaneously in IPv4 and IPv6 modes. Figure 1: IPv4 and IPv6 Dual-Stack Architecture in a Subscriber Access Network Terms Used in IPv6 Subscriber Management Documentation

One technique, called dual stack, involves running IPv4 and IPv6 at the same time. End nodes and routers/switches run both protocols, and if IPv6 communication is possible that is the preferred Dual Stack Network - Cisco

RFC 4241 Dual Stack Access Service December 2005 1.Introduction This memo is a digest of the user network interface specification of NTT Communications' dual stack ADSL access service, which provide IPv6/IPv4 dual stack services to home users. In order to simplify user setup, these services have a mechanism to configure IPv6 specific parameters automatically.

The Dual Stack Transition Mechanism (DSTM) can be an ideal approach for early adopters of IPv6 with an IPv6 dominant environment that still need to communicate with legacy IPv4 nodes. Regardless of the migration strategy chosen, the most important aspect is planning ahead.