Can ipv4 and ipv6 coexist

The dual stack routers encapsulate the IPv6 packet inside into the IPv4 packet, just like the router encapsulates other data into IPv4 packets. We can communicate using tunneling method, with isolated IPv6 networks without upgrading the IPv4 infrastructure.

We only required tunnels configuration between border routers or between a border router and a host however, the important point is that both tunnel endpoints must support both IPv4 and IPv6 protocol stacks. We can configure tunneling either manually or dynamically.

The important methods for tunneling are listed below. The figure below illustrates tunneling It is just like a permanent link between two IPv6 domains over an IPv4 backbone. We use manual tunnelling for regular secure communication between two nodes. The nodes may be end devices or maybe two edge devices. We can also configure manual tunnel between a host and an edge device.

An IPv6 address is manually configured on a tunnel interface, and manually configured IPv4 addresses are assigned to the tunnel source and the also to the tunnel destination. The host or edge device at each end of a configured tunnel must support both the IPv4 and IPv6. Cisco Express Forwarding switching can be used for IPv6 manually configured tunnels, or Cisco Express Forwarding switching can be disabled if process switching is needed.

In the IPv4-compatible tunnel method, the tunnel destination is automatically determined by the IPv4 address in the low-order 32 bits of IPv4-compatible IPv6 addresses. These are some of the most popular ways to get IPv6 and IPv4 on the same network. There are many others. Want to know what the worst news about all of them is? None of them are very compatible with the others.

As I've said before, like it or lump it you are going to need to move to IPv6. In the meantime, you're almost certain to need one, or more, of these technologies in the next few years. It' all too easy to mix and match equipment and methods in ways that will slow your network down to a crawl. I will also add that you must test out the hardware and software before signing off on it. I've already found that a lot of stuff, which says it's IPv6 ready isn't really, but that's a story for another day.

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Here's what I did. You agree to receive updates, promotions, and alerts from ZDNet. You may unsubscribe at any time. By signing up, you agree to receive the selected newsletter s which you may unsubscribe from at any time. You also agree to the Terms of Use and acknowledge the data collection and usage practices outlined in our Privacy Policy. My Profile Log Out. Join Discussion. Add Your Comment. IPv4 and IPv6 must coexist for some number of years, and their coexistence must be transparent to end users.

If an IPv4-to-IPv6 transition is successful, end users should not even notice it. A dual-stack device is a device with network interfaces that can originate and understand both IPv4 and IPv6 packets.

Other strategies, such as manually or dynamically configured tunnels and translation devices exist, but dual stacking is often the preferable solution in many scenarios.

The dual-stacked device can interoperate equally with IPv4 devices, IPv6 devices, and other dual-stacked devices. When both devices are dual stacked, the two devices agree on which IP version to use.

The transition is driven by DNS.