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Do You Need IPv4 Anymore?
Setting up and maintaining access networks today requires double the effort due to the parallel coexistence of IPv6 and IPv4. Dual-stack has network engineers and sysadmins do twice the amount of work, so there must be a good reason for it, right? The answer is “probably not”! The IPv4 network is not really needed, with the exception of LANs with devices that do not support IPv6 after almost 30 years.
The moment we turn on DHCP, all devices will get an IPv4 address too, and they may not take full advantage of our IPv6-only infrastructure, or may unnecessarily offload a lot of the translation tasks to the router, when they’re perfectly capable of performing them themselves. This allows a great deal of flexibility: the critical path, between access devices and the Internet, can run on 100% stateless IP routers, using high end silicon, or even Terabit-class software routing. With existing IPv6 Transition Mechanisms and the current state of OS and software support, not only in network gear, but also end devices, I honestly believe that many modern access LANs can operate with IPv6-only setups without problems.
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