Understanding vGW Series IPv4 and IPv6 Dual Stack Support

This topic includes the following sections:

Dual Stack Background

IPv6 is designed to extend and enhance IP addressing while maintaining IPv4 functions that work well with new applications. Enterprises and service providers who convert their environments to use IPv6 often carry out the transition in phases during which some of their devices continue to use IPv4 addresses. To ensure optimum performance and a smooth transition, many companies implement a dual-stack architecture during this period. When a device has dual-stack capabilities, it has access to both IPv4 and IPv6 networks. It can use both protocols to connect to remote devices and destinations in parallel.

A dual-stack device can connect to an IPv4-only device or an IPv6-only device, or it can connect to another device that implements dual stack.

Note: By default, a dual stack vGW Security Design VM communicates with a vGW Security VM using the IPv4 protocol. However, you can use the vGW CLI to change the default IP protocol used by setting the center.dual.stack.default.communication.ipv4 parameter to false.

center.dual.stack.default.communication.ipv4=false

By default, this parameter is set to true.

This parameter is relevant only if the vGW Security Design VM is configured for dual stack and one or more vGW Security VMs is also configured for dual stack. In all other cases, the protocol used is the one that is common to both the vGW Security Design VM and the vGW Security VM, and this parameter is irrelevant.

For additional information on address assignment, see Understanding IPv6 Addressing.

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