I had the same experience with this modem as RTuesday (in a post from Dec. 2015) -- I got this modem, no problem with it coming up but no IPV6. Well, I telnet'ed into the modem, poked around, and got IPV6 going. I *found* what I needed via telnet, don't worry! All the setup is in browser. This description looks long but it's just a web form so it's not too bad.
So, first -- what is the deal with the manual? The paper manual, and downloadable PDF, don't really match the menus on the device that closely, either with 1.0.0.0 or 1.0.0.1 firmware. In particular, several IPV6-related options seem to be missing. Well, they are but they aren't...
First, log into the modem, go to "Setup->Internet Setup", pick your DSL Config and click Edit. This MUST be set to "IPV4", not "Both". I think if a DSL provider provided both IPV6 and IPV4 all the way to the user, setting this to "both" would be all you'd need. Set to "Both", the modem tries to get both IPV4 and IPV6 address, fails to get IPV6 address (because CL is not really running an IPV6 network), but this makes the connection inelligible in a few steps so it must be off.
Next is the tricky step. Centurylink uses a system called ipv6rd.. it's nowhere to be seen in the menus (despite being in the manual, that page simply doesn't seem to exist.) Telnet'ing in, I found (whether it's intentional or not) an "iptunnel.html" does exist, but is missing a few tags that would make it show up in the menu. (Yes, that left-hand menu is built on-the-fly by a server script, not some canned HTML.) Click on "Advanced". Look at the URL, and see the "var:menu=advanced&var:page=wadvance". Change "wadvance" to "iptunnel" and hit return.
Click "Configure 6in4 Tunnel". You have a screen with "IpTunnel" and "IPv6 Rapid Deployment". You have to fill out both.
Click "IpTunnel"'s Add button. Give the tunnel a name (I used "Centurylink".. I think it literally doesn't matter what you put here), there's only one option for tunnel mode, wan, and lan, so click "Apply". I had my WAN set to "Both" (both IPV4 and IPV6) initially, so I had *no* options in "WAN" and it said "ERR_MALLOC_FAIL" when I clicked "Apply." So if that happens, go back and don't skip step 1 8-)
CL's IPV6rd settings are (from CL's web site):
6rd prefix: 2602::
6rd prefix length: 24
IPV4 CE mask length: 0
IPV4 border router address: 205.171.2.64
Click "Add" on "IPv6 Rapid Deployment". "Mechanism" and "Dynamic" have only one choice.
Prefix: 2602::/24 (this is both prefix and prefix length from CL's settings.) IPV4 mask length 0, and BorderRelayAddress is 205.171.2.64. I clicked "Apply". Click "Select" on the newly-added "Ipv6RapidDeployment" line, *and* click "Activated" on the IPTunnel. The status shows "enabled" and "connected" already, as far as I know IPV6 is up then already. If not, reboot.
Oh yeah.. in Setup->Local IPV6 network, turn on RADVD if it's not already, this lets your local computers get IPV6 addresses. From what I read, DHCPV6 is mostly to let clients get IPV6 DNS servers. I left it off, I found this unnecessary, both Google and Centurylink's IPV4 DNS servers return IPV6 info just fine. One final note -- if you go "Status" and see no mention of IPV6, yeah it isn't there. In "Setup->Local IPV6" you'll see a "site prefix" set up to see it's working.
Cheers!
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