McManus adds that Verizon hasn't reported any IPv6-related security incidents, either. "We are seeing nothing out of the ordinary right now," she says. "Knock on wood that it will stay the same."
IPv6 traffic spiked last night when World IPv6 Day began, and it has continued to be elevated since then.
Arbor Networks reported that overall IPv6 traffic volumes had doubled during the first 12 hours of World IPv6 Day.
BY THE NUMBERS: IPv6 traffic surges at launch of World IPv6 Day
"We saw a massive jump that we publicized on our Facebook page within the first hour," Levy says. "The numbers are still small when compared to IPv4. But I would say that we've seen a fivefold increase in IPv6 Web traffic, and the day is not over."
Akamai, a content delivery network supporting 30 participating websites, experienced a peak of 458 hits/second of IPv6 traffic one half hour after the trial began. Akamai is averaging 287 hits/seconds -- a tenfold increase over IPv6 traffic levels prior to the event.
"We saw a fantastic surge of IPv6 traffic, but on an absolute scale it was still a really small percentage," says Andy Champagne, vice president of engineering at Akamai, who added that IPv6 still represents less than 1% of total Internet traffic. "We will do 10 to 15 million hits/second on IPv4, and we're doing 500 with IPv6."
Champagne says Akamai has not seen more broken IPv6 connections than expected, nor has it noticed any major attacks aimed at IPv6.
"The Internet is under constant attack, and a lot of it is insignificant," Champagne says. "We did see some DoS attacks that were going on over IPv4, and when folks switched to IPv6, the attacks switched to IPv6. But it still wasn't material. We haven't seen any massive attacks."
Champagne says Akamai is pleased with how World IPv6 Day has gone so far.
"What we're happy about is that it looks pretty anticlimactic," Champagne says. "Now folks can be a little bit more confident about using IPv6 in production because everybody went into the water today and found out that the water is fine."
McManus is hoping that content providers such as Google and Yahoo will follow up with the success of World IPv6 Day by permanently enabling IPv6 on their sites.