IPv6 setup Comcast/Xfinity Internet

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What steps will reproduce the problem?
1. IPv6 doesn't grab address/connection
2.
3.

What is the expected output? What do you see instead?
Connect to IPv6 addresses not IPv4

What version of the product are you using? On what operating system?
newest 3.4.3.7-072 DLNA build

I have tried every setting with reboots afterwards with modem/router/and 
computers/phones...

Any specific settings to get Comcast IPv6 to work?  my CMTS is IPv6 enabled 
it's just up to me to get my router to connect to IPv6 addresses.

Thanks

Original issue reported on code.google.com by ceeKayyy...@gmail.com on 30 Dec 2013 at 10:40

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bump! any solutions?

Original comment by lifehack...@gmail.com on 13 Jan 2014 at 8:45

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Just chiming in here - same problem with RT-N56U_3.0.3.7-079_base. My settings 
are as follows:

IPv6 Connection Type: Native DHCPv6
WAN IPV6 Settings: DHCPv6 (Stateful, IA-NA)
Get DNSv6 servers automatically: Yes
Get LAN IPv6 address via DHCPv6: Yes
Enable LAN Router Advertisement: Yes
Enable LAN DHCPv6 Server: No

The router itself gets a WAN IPv6, as well as a LAN IPv6 subnet. I can even 
wget ipv6/ping6 websites from within the router. Clients behind (wired and 
wireless) are getting IPv6 addresses via RA, and are getting assigned the 
link-local IPv6 of the router (br0) as their default gateway, but they're not 
able to browse IPv6. If I run a tcpdump on the WAN interface on the router, I 
can see requests going out from the clients, but nothing is coming back in.

Original comment by meta...@gmail.com on 19 Feb 2014 at 6:42

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This is still broken in RT-N56U_3.0.3.8-081.

Original comment by meta...@gmail.com on 12 Apr 2014 at 8:43

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It works for me with Comcast under RT-N65U_3.0.3.8-081_base.  Here are my 
settings:

IPv6 Connection Type:           Native DHCPv6
Get WAN IPv6 Address From Souce:    From both sources
Enable Privacy Extensions (RFC 4941)?   Yes
Get DNSv6 Servers Automatically?    Enabled
Get LAN IPv6 Address via DHCPv6 IA-PD?  Enabled
Enable LAN Router Advertisement?    Enabled
Enable LAN DHCPv6 Server?       No

After restarting the router and modem, it usually takes some time, maybe 5 to 
10 minutes before my devices get IPv6 addresses.

Original comment by jdwhite9...@gmail.com on 30 Apr 2014 at 1:49

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Interesting - no go for me even using the same settings. Is your default route 
a link local address?

Original comment by meta...@gmail.com on 3 May 2014 at 12:06

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How do you tell if it's a link local address?

Original comment by jdwhite9...@gmail.com on 8 May 2014 at 7:24

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Right-click on the network icon in the system tray, left-click on "Network and 
Sharing Center" from resulting menu, left-click on network adapter indicated by 
"Connections", then left-click on the "Details..." button.  Towards the bottom 
of the window that opens, there is an entry for "Link-local IPv6 Address". In 
Internet Protocol Version 6 (IPv6), the address block fe80::/10 has been 
reserved for link-local unicast addressing.

I have RT-N65U_3.0.3.8-081_full on my router behind an Arris TG852G gateway.  
It is set for NAT & DHCP by default.  I can get IPv6 addresses for all the 
devices on my local network if I set my RT-N65U as an access point.  When it is 
set as a router, I have to set it as a DHCP server with NAT, or I don't get any 
Internet connectivity.  Even then, I get only IPv4.  

May I suggest a "gateway" setting in addition to "Access Point" and "Router", 
like dd-wrt?

Original comment by pcarlson...@gmail.com on 8 May 2014 at 10:14

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Under Network Connection Details tested with both a wired and a wireless 
connection I'm getting:

IPv6 Address        2601:...
Temporary IPv6 Address  2601:...
Link-local IPv6 Address fe80:...
IPv6 Default Gateway    fe80:...
IPv6 DNS Server     (blank)

I hope that helps.

Original comment by jdwhite9...@gmail.com on 12 May 2014 at 2:46

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Your IPv6 DNS server line is empty? Assuming you're on Windows, what happens if 
you do 'ping -6 google.com -n 5'?

Original comment by meta...@gmail.com on 14 May 2014 at 8:38

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IPv6 is now working for me as well, however, I get 2001:558:feed::1 & 
2001:558:feed::2 in the IPv6 DNS server line.  At least some of the following 
seemed to help:  
1) Connected computer directly to Xfinity gateway (mine is a TG852G) to get 
Link-local IPv6 and Default gateway addresses. 
2) Entered these values in the  Gateway > Connection > Local IP Configuration 
page of the TG852G.  
3) On RT-N65U Advanced settings> LAN > Route, I enabled "Use DHCP Routes". IPv6 
settings per "jdwhite9" post #4 above.  
4) Powered off the RT-N65U, then switched on. 

Result:
'ping -6 google.com -n 5'

Pinging google.com [2800:3f0:4001:814::1003] with 32 bytes of data:
Reply from 2800:3f0:4001:814::1003: time=207ms
Reply from 2800:3f0:4001:814::1003: time=187ms
Reply from 2800:3f0:4001:814::1003: time=186ms
Reply from 2800:3f0:4001:814::1003: time=185ms
Reply from 2800:3f0:4001:814::1003: time=172ms

Ping statistics for 2800:3f0:4001:814::1003:
    Packets: Sent = 5, Received = 5, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 172ms, Maximum = 207ms, Average = 187ms

Thanks, jdwhite9!

Original comment by pcarlson...@gmail.com on 21 May 2014 at 8:49

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You're welcome pcarlson.  I'm glad it helped.

When I try 'ping -6 google.com -n 5', it sometimes does not get a response from 
the first ping attempt.  The other 4 respond though.

I tried the command several times.  Most of the time all 5 pings responded as 
expected.

Original comment by jdwhite9...@gmail.com on 22 May 2014 at 3:35