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Comment by buzer | Hacker News Reader

That doesn't sound correct. Are you absolutely sure you aren't also getting a prefix delegation thru DHCPv6? That's currently the common way to provide IPv6 connectivity currently for residential users.

From what I remember hearing, Comcast was giving /60s thru PD.

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No, I don't get a prefix. No /60, no /64, not even a /120, just one single address. A /128. Maybe I should jump on their forums and raise a fuss. I'm not at all confident that calling tech support would get me to someone who even had a clue what IPv6 is.

Just to be sure, with a routed network being aimed at your house, you'll actually receive two subnets (well, a single address in one subnet, and a whole second subnet). You need to use DHCP-PD or similar to make use of it.

The /128 sounds perfectly normal, and is used as a "point to point" link between the ISP and your modem. Over this, DHCP prefix delegation typically gives you a whole second subnet of /60 or so. If your modem isn't handling DHCP-PD, then all your see is 1 measly address even though they've likely allocated and pushed 295,147,905,179,352,825,856 addresses to you.

Hmmm, maybe I should revisit this. I first tried it a year or so ago with pfSense on a virtual machine. Between the IPv6 issues and generally poor performance (long story), I went back to my IPv4-only configuration with DD-WRT on a D-Link DIR-825.

I'm now using a Ubiquiti EdgeRouter POE, and maybe I should give it another shot. I'm not convinced I'll actually get a prefix from Comcast, though.

It may differ by region, but in the SF Bay Area I've been getting a /60 from Comcast residential for a few years now using a MikroTik router. See here: http://i.imgur.com/2mrRk01.png

The edge router can do DHCP-PD, but it needs some configuration for it to do it, there's lots of info on the Ubuiquiti forums about it. Good luck!

Comcast has a decent ipv6 technology group (by necessity - they were an early adopter/innovator of carrier-grade v6 as they have more CPE to address than can be fit into 10/8). If you ever become interested in resolving this you may want to dig through http://www.comcast6.net and see if you can find a direct contact to work with.

I don't have any contacts myself, I'm just a customer and interested observer.

I can confirm that, my home network is currently routing a /60 from Comcast.

FTR, I don't get a prefix from them, either.

I tunnel all traffic through Comcast via a VPN, though, because I consider them a hostile network, so I don't especially care.

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