There have been calls clamouring that we'd be running out of IPv4 Internet addresses "very soon" back in 2009. In January 2010 it was announced again that we were almost out of them. In July 2010 it was predicted that by 2011, that was it. And yet, here we are in 2014, with approximately 24 million IPv4 addresses in the available pool for the region, which will, again, all likely be handed out by 'sometime in 2014.' Whatever happend to the IPv4 address crisis? Why are we not using IPv6 already? Network World explains:
Well, IPv6 is not backward compatible with IPv4, meaning network operators need to run a dual stack IPv4/IPv6 network for years to come. And for IPv6 to work, it needs to be implemented end to end, meaning IPv6 has to be enabled by network hardware vendors, transit providers, access providers, content providers, and endpoint hardware makers.
Since theres no economic incentive to being the first to invest in revamping your protocol support, many hardware and service providers stood on the sidelines and waited for momentum to build.
For enterprises, it made no sense to upgrade to IPv6 if their ISPs were still running IPv4. As John Brzozowski, fellow and chief architect for IPv6 at Comcast Cable, puts it: We had a chicken-and-egg problem. "Service providers didn't want to implement IPv6 because the content providers weren't there, and content providers didn't want to implement it because the service providers weren't there."
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