Your existing IPv4 address allocations may be insufficient to support a sudden increase in the number of connected devices, as many organisations experienced with the rapid deployment of IP-enabled wireless handheld products and similar devices a few years ago.
There is no specific date when everything must be upgraded to IPv6, although some organisations, including governments, have already identified target dates for their own IPv6 implementation. IPv6 and its transition mechanisms have been designed for a long period of co-existence with IPv4, and it is expected that IPv4-only systems and applications will survive for many years.
However, IPv6-only systems are expected to arise and many of these users are likely to be in emerging business markets and developing countries. Implementing IPv6 requires planning and with the IPv4 address space nearly exhausted, network operators should already be incorporating IPv6 into their upgrade and procurement plans.
In practical terms, no. This will be more than sufficient to support trillions of Internet devices for the forseeable future. Possibly never. The purpose of deploying IPv6 is to ensure network growth and continued interconnectivity when IPv4 address space becomes depleted and difficult to obtain. In addition, as the global Internet continues to expand, it is likely that an increasing number of Internet sites will only be available via IPv6.
To avoid problems, networks and connected devices should be fully IPv6-enabled to take advantage of IPv6-only sites, but IPv4 can co-exist with these until enterprises determine that it is no longer needed or cost effective to maintain.
In practice, it may never be cost-effective or possible to upgrade certain legacy systems, but translation mechanisms such as NAT64 and XLAT are available to support these for as long as these are required and in use. These port numbers are 16 bits, which means a theoretical maximum of 65, private IPv4 addresses can be associated with each public IPv4 address. Some large ISPs are even running into problems with the IPv4 address space reserved for private addresses, as the largest block This then means that multiple layers of NAT are required, which further adds to the performance and management complexity issues.
NAT can also cause problems with certain higher level protocols that were designed for end-to-end connectivity or that employ IP addresses in the application data stream, and so should really only be considered a temporary solution. IPv6 needs to be deployed to ensure the Internet continues to perform well and is able to scale into the future. Translating addresses does not provide any security benefits. In many cases NATs require an outgoing connection to be present before they will allow an incoming connection to succeed.
You should contact the RIR for your region, or alternatively your own Internet connectivity provider for more information on how to acquire IPv6 addresses. It may also be good idea to use this opportunity to redesign your addressing plan, taking advantage of the greater flexibility of IPv6 to assign subscriber address blocks more optimally.
Similarly, customer sites may use IPv6 as an opportunity to redesign and optimise their internal addressing plan. Do an audit of your current IPv6 capabilities and readiness. Assess the level of IPv6 technical knowledge within your organisation and make plans for staff development and training to support IPv6 implementation. Think about which of your services will lose business if they are only accessible to IPv4 users and make them a priority for IPv6 capability.
For example, you may plan to implement an IPv6-enabled web server for external customers before converting your internal network. Remove obstacles to enabling IPv6 including identifying any legacy systems that can not be upgraded, and choose a solution for them. Contact your vendors to find out about IPv6 support in their current products and future releases and ask your ISP about their plans to support IPv6. Use the Deploy IPv6 Resources for help along the way. What is IPv6? Who created IPv6 and how long has IPv6 been available?
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