Test for IPv6 connectivity

[Taffycat]

Some excerpts from a longer article by Woody Leonhard at "Windows Secrets" which I thought might interest some of us.

[FONT=Arial,Sans-serif]Caution: Bumps in the road to IPv6
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[/FONT]...To handle the vast number of computers and other devices now connecting to the Internet, the IANA and ISPs are in the process of rolling out IPv6. The new IPv6 addresses appear as a group of eight numbers, each with four hexadecimal digits, such as:

2001:cdba:9abc:5678:ffff:ffff:face:b00c

Clearly, we aren't going to wake up one morning to find the Internet working with IPv6. Instead, there will be a period of years — probably many years — where IPv4 and IPv6 need to peacefully coexist.

And that's where the so-called dual stack comes into play.

Testing for dual-stack compatibility

Running IPv6 on Windows is a piece of cake: IPv6 has been built into Windows since XP Service Pack 2. If you are using HomeGroup on Windows 7, you already have IPv6 up and working between your homegrouped PCs. Similarly, all modern versions of Linux and Mac OS speak IPv6, as do most smartphone operating systems.

...A problem arises, though, if your router or your ISP's equipment thinks it can handle IPv6 and really can't. Your PC tries to connect via IPv6 but something gets lost in the communication. You might experience delays of a minute or more while your PC battles with the site's IPv6 stack, can't get through because of intermediary problems, gives up after a while, and finally falls back to IPv4.

[FONT=Arial,Sans-serif]On a Facebook blog, Donn Lee put it this way:
[/FONT] [FONT=Arial,Sans-serif]"Testing IPv6 is important because recent studies indicate about 0.05% of Internet users (1 in 2,000) can't reliably connect to websites that enable both IPv4 and IPv6 addresses (known as "dual-stacked" websites). This has resulted in a classic chicken-and-egg puzzle right now: websites don't want to enable IPv6 because a small number of their users may have trouble connecting."
[/FONT][FONT=Arial,Sans-serif]As June 8 rolls around, you might want to let your friends and colleagues know that they're going to be part of a huge test. Have them go to one of the test sites and see whether the connection goes through. If it fails, have them complain — loudly — to their Internet Service Provider.

[/FONT]You don't have to wait for June 8, though. ISOC has a website set up to perform a one-off test of your current configuration. Go there now, and you'll receive a report like the one in Figure 1.

Make sure you buy IPv6-capable routers

Incredibly, some router manufacturers are peddling goods that aren't yet IPv6-compatible. If your ISP provided the router you're using now, you don't need to worry about it — sooner or later, they'll have to ensure it runs IPv6 and the swap-out shouldn't cost you anything. (Not directly, anyway.)

But if you're buying your own router, be very aware of the fact that most consumer routers don't run IPv6. Julie Bort at InfoWorld reported that, as of a month ago, none of Cisco's consumer Linksys routers runs IPv6. For a follow-up story, Cisco stated that "Linksys routers being launched this spring will have IPv6 support" and that the "Linksys E4200 router we launched in January will have an [IPv6] firmware upgrade planned for April." But there's still no word about which, if any, of the zillions of legacy Linksys routers will run IPv6.

If you're thinking about buying a router and want to make sure it'll run IPv6, you can look on the box to see whether it's certified by the IPv6 Forum. If you want the full details, though, check whether the router is listed on the American Registry for Internet Numbers (ARIN) Broadband CPE analysis site. Bet you'll be a little bit surprised — and not pleasantly.

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[Abarbarian]

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