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Comcast's help page (http://customer.xfinity.com/help-and-support/internet/about-ipv6/) directs me to http://www.comcast6.net/ which is 404. :-/

Contact the guys here about it. I helped them troubleshoot some IPv6 issues in my area and they are actually very very eager to get it right.

In fact, much as I dislike Comcast in general, they're IPv6 rollout has been pretty well handled.

Comcast has over 25% of their network IPv6 enabled as of November last year. This is much more that "3 cities".

As for taking back IPv4 addresses, that has to be the most ludicrous thing I have heard. There is a huge amount of IPv4 only content out there which you need IPv4 addresses to reach. Now you can make the consumer IPv6 only by use NAT64 + DNS64 to reach this content but you still need IPv4 addresses on the public side of the NAT64. Additionally NAT64 breaks functionality you get with having direct, unshared, IPv4 connectivity.

ipv6 (which no consumer ISP is supporting, not even comcast who was running trials)

As of December last year, more than 25% of Comcast customers can get native dual stack broadband - see http://www.comcast6.net/

Actually, ComCast is one of the few large providers that deploys DNSSEC and IPv6:

http://dns.comcast.net/
http://www.comcast6.net/

actually, Comcast is offering a very good 6RD service to its customers. 6RD is my favorite IPv6 tunneling technology as it is more or less as good as native. It gives you your own globaly routed /64 v6 prefixes from you ISPs v6-pool and if configured correctly it is as effective as native v6 would be. I work at a major ISP in Sweden and we are currently looking in to deploying 6RD to be able to deliver IPv6 to all of our customers within the near future. More about Comcasts 6RD here: http://www.comcast6.net/index.php/6rd-config

Have you, by any chance, imported the CAcert.org root certificate(s)?

I don't recall if CAcert.org is included in by default... I'm thinking not.

If you had trouble figuring out the certificate was signed by CAcert.org, nor do you know who CAcert.org is or the X.509 CA racket in general, I'd suggest you just wait for your ISP to do everything for you.

Comcast is currently deploying IPv6. A few news items down, they state: IPv6 has been launched on all Arris DOCSIS 3.0 C4 CMTSes, covering over 50% our network. We are targeting completion of the rest of the network by mid-2013.

ISPs are the problem here. But with government-granted monopolies without regulation, they have no incentive to support IPv6.

Yep. I'm on Comcast. You know, the US ISP that made a big deal about supporting IPv6, including making dumb posters about it? I've got an IPv6 capable device serving as a router/IPv4 NAT. I upgraded my cable modem so that it's be able to do IPv6. Let's see what IPv6 addresses were assigned to me by Comcast...

That'd be none. Still. Because IPv6 hasn't rolled out in my area yet. Or maybe it hasn't rolled out for the particular cable modem I have, I'm not sure. Who knows, because Comcast sure isn't making it clear what areas and what devices do and don't get IPv6 support from them.

For example, when I look at Comcast's site, I see "When Comcast decided to participate in World IPv6 Launch, we committed to enabling at least 1% of our customers with IPv6 by June 6, 2012." So, how does that figure into the 60%? If there are 50 ISPs in the world, but Comcast has 5% of the subscriber base, is that 2% out of the 60%? Or is it 5% Or is it .002%? I'm curious how this 60% number was calculated.

Really now? When have you ever known a publicly held company to prioritize development and long term results, over short term profits.

Well, Comcast is doing that very thing right now. The company is an enigma. They're moving the state of the IPv6 art forward in a tangible way. Their business class service is great. Every salesperson and tech I've dealt with has been sharp, helpful and friendly. At the same time they throttle traffic, then deny that they're doing it. They maintain low (even at 300GB) caps. Their CPE quality (from DVRs to routers) is astoundingly awful (even business class).

I think you made a mistake in your link.
I'm sure you meant to link to an announcement from the IETF and ISOC that they're calling off the whole thing, or at least a post from Google saying that they won't go through with that whole IPv6 thing at all, but it appears you accidentally linked to yet another blog claiming that IPv6 will never take off because it actually requires work on the part of the implementers instead of using magic pixie dust to "just add more numbers".
This despite that the very FA shows that Google remains committed to getting 100% IPv6-compatible, and that large ISPs like Comcast are initiating IPv6 trials this year.

Initially, they'll be doing this on a limited basis, and only in homes that have just one computer, where no subnetting will be required, and there, they will just issue a single /128. That /128 cannot be NATed. Later, when they introduce home networking, they would issue /64 addresses, which is what most home routers support anyway.

There are content providers starting to use Dual-Stack so they are supporting both IPv4 and IPv6.
Here are just some of them:
http://www.v6.facebook.com/
http://ipv6.google.com/
http://www.comcast6.net/

Bit of a shame they still don't publish AAAA records for their main addresses though :(

Also, v6 facebook is a bit broken - a lot of their internal links are absolute references to www.facebook.com, so you only have to click a few things and suddenly you find you're on the v4 site instead of the v6 one.

There are content providers starting to use Dual-Stack so they are supporting both IPv4 and IPv6. Here are just some of them: http://www.v6.facebook.com/ http://ipv6.google.com/ http://www.comcast6.net/

Comcast is rolling out IPv6 right now in the US. http://www.comcast6.net/

They have had a beta rollout for the past year to work out the issues.

Customers in Denver, CO are currently getting IPv6 to their homes right now.

Hopefully they'll start rolling it out in the San Francisco bay area soon.

Comcast is already making steps towards IPv6: http://www.comcast6.net/ . The latest news entry on that site:

"Comcast and the Internet Society today announced that Comcast will participate in World IPv6 Day on June 8, 2011. We anticipate having our IPv6 trial users participate in this event, which will give them the opportunity to access many more sites natively over IPv6. In addition, we plan to have more of our websites available over IPv6."

It would be cool to have /. participate, even if they are hiding behind some ipv6/ipv4 proxy.

? They have for quite a while, actually.

Some areas (Denver being the big one) is having native IPv6 deployed as their first 'test' deployment. Other cities will follow.

Everyone else can still use 6rd or 6to4

http://www.comcast6.net/6to4-config.php

http://www.comcast6.net/6rd-config.php

There's also an image for openWRT users:

http://sourceforge.net/projects/dslite-6rd/files/

? They have for quite a while, actually.

Some areas (Denver being the big one) is having native IPv6 deployed as their first 'test' deployment. Other cities will follow.

Everyone else can still use 6rd or 6to4

http://www.comcast6.net/6to4-config.php

http://www.comcast6.net/6rd-config.php

There's also an image for openWRT users:

http://sourceforge.net/projects/dslite-6rd/files/

Comcast is already doing IPV6 and unrelated but also DNSSEC in certain areas.

http://www.comcast6.net/
http://www.dnssec.comcast.net/

Yes, according to comcast http://www.comcast6.net/ they are currently giving out 18,446,744,073,709,551,616 ip addresses to each customer.

http://en.wikipedia.org/wiki/6to4#Consumer_routers_with_6to4_support

http://www.comcast6.net/

Apple's base stations are certified IPv6 ready, which means not only do they work with IPv6, but they have it on by default. The others might require you turn it on. Instructions on how to set up some of them are on Comcast's site.

I've had Comcast internet for two years, they haven't MAC-locked their service in the time I've had them. If you want more than one device at your house to work, you need a NAT/PAT gateway whether you use WiFi or not, as you only get a single IP address from Comcast.

Have you set up to use Comcast's 6to4 or 6rd tunnel service? I am on Comcast with 6rd set up and I get 9/10 (only warning is that Comcast DNS isn't on v6 yet).

Have a look here for 6rd instructions. Otherwise, set up 6to4 using 192.88.99.1.

Not yet, Comcast is currently trialling IPv6 in select locations (i.e. San Francisco, NYC, Boston, etc.). They expect to roll out IPv6 to the rest of us some time this year. (You can keep up with their progress here.)

Meanwhile, if you really want IPv6 for whatever reason, I set up a tunnel with Hurricane Electric. After configuring my computers and router (DD-WRT, IPv6 is fully supported), I had IPv6 both internally and externally (i.e. IPv6 DHCP and access to the IPv6 Internet). You can set your own up here.
(I took it down shortly afterward, because I don't know about any security ramifications this would have.)

They also have 6RD.

All you need to do is turn it on. And if you have certain base stations, it is on by default.

http://comcast6.net/

Actually, Comcast is currently conducting trials of IPv6 with their subscribers. I am not participating right now because I had to cancel my service, but I was very close to participating six months ago.

* almost no home router supports IPv6

Linksys E3000 router

* almost no provider offers IPv6

http://www.comcast6.net/

* almost no webpage runs IPv6

You mean like Google? http://www.google.com/intl/en/ipv6/

status of comcast ip6 http://www.comcast6.net/ at&t - lagging http://www.networkworld.com/news/2010/102710-att-ipv6.html

Comcast, which is "some ISP" has been leading the way with IPv6 migration. Additionally, I work for some other ISP and we are quite serious about it. We audited last year and have replaced many many millions of dollars in equipment to get ready.

I'm more afraid of "some big corporation" not "some ISP" as many love to hate.

You just need to sign up with Comcast: http://www.comcast6.net/

They are only running trials at this exact moment, but they should have general IPv6 availability soon enough.

It's not just word on the street. Comcast has been launching IPv6 tests this year. Check out Comcast's page.

Comcast6.net IPv6 Information Center

Does that count as moving in the right direction? I'm hardly going to claim these guys are perfect, but it looks like something.

Comcast is doing an IPv6 trial right now. Freenet in France has had IPv6 running using 6RD for quite a long time now. You can get IPv6 tunnels from Hurricane Internet and Sixxs. If you are interested in IPv6, go start using it. Don't just sit there on your (no doubt svelte) ass! :')

Probably because they aren't rebranding their corporate entity.

Also, if you think this is the first cool thing Comcast has done in support of the internet, you're dead wrong. They have some very talented and involved engineers working hard on IPv6, publishing IETF drafts on IPv6 transition strategies, making nice after their BitTorrent escapades, etc.

Say what you will about their business practices, customer service, reliability, whatever... But when it comes to IPv6 and being involved in the technical community, they're kicking ass and taking names.