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What were IPv6 traffic rates during the recent World IPv6 Day event? The June 8 event, which tested the effects of more than 430 Internet content providers running their websites in a dual IPv4/IPv6 mode, was notably without serious incident or outages. And while traffic was miniscule compared to the total amount of Internet traffic crossing networks worldwide--just 0.3 to 0.5 percent of all traffic--IPv6 traffic was higher than it has yet been.