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Are there any IPv6 clients in the real world? If not, is there any other reason to support IPv6?

(My understanding is that with the advent of WANs and such IPv6 is not necessary, hence extremely low if any adaption. Is that correct, or will we be seeing increased IPv6 use in coming years?)

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migrated from stackoverflow.com Jun 7 '11 at 8:36

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I think the real question is whether there are any IPv6-only clients, most Windows 7 and OS X machines are dual stack enabled. –  Steve-o Jun 6 '11 at 22:56
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3 Answers

up vote 4 down vote accepted

If you're running a small in house server for you company for their computers, you won't probably need it.

For the rest of the web, IPv6 is something happening right now and you NEED to support IPv6, because there are many and many people joining to the IPv6 network and the transition between the two represent lose of service and delays, so yes you server really need to get an IPv4 and a IPv6 address. IPv6 is also great in other conditions like in media stream because you can just send one packet to multiple clients at the same time instead of sending the same content repeatedly for multiple clients — Less bandwidth needed to live stream.

For instance in my country, Portugal, out brand new optic fiber network is covering 90% of the country and it's fully IPv6... So I guess that other countries are doing the same now. There are no IPv4 addresses—we ran out of them ;)

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Of course there are. I actually have IPv6 access at home :) Surely the traffic levels are low currently, but if you're a server admin, you should really consider enabling IPv6 (and all relevant stuff like AAAA records on your site hostnames). IANA has allocated all free IPv4 space to the regional internet registries and thus the allocation of IPv4 space will come to an end soon. A lot of major internet companies are currently testing with IPv6, or already have it enabled on some services. On Wednesday june 8th 2011 some major companies like Google and Facebook will enable IPv6 on their hosts. It'll be a testcase to see if and how stuff breaks. See http://www.worldipv6day.org/ for more info ;)

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If not for the non-zero amount of IPv6 clients at the moment, do it for being ready when those numbers start to rise. –  Koos van den Hout Jun 10 '11 at 9:24
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If you have any visitors outside the United States (particularly from Asia), the answer is an unqualified "yes, implement ipv6 on your webhost". See ipv6ActNow.org for more information.

Some countries (like Japan, which has something like 25% of all ASNs announcing IPv6 space), have been forced to adopt IPv6 very quickly due to lack of IPv4.

Percentage of BGP speakers announcing IPv6 networks

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Wrong. Regardless of whether or not those places are being forced to host using IPv6, they still have full access to all IPv4 addresses elsewhere, so there is NO need to switch to IPv6 to cater to them. –  John Gardeniers Jun 7 '11 at 8:51
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Correct. Those new Asian clients may have IPv4 access via nat64 or nat44, but in the long run their 'experience' over v4 will probably deteriorate. Better be prepared. –  Koos van den Hout Jun 10 '11 at 9:26
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