RT-AC68U Doesn't Route IPv6

[yoleska]

From the Asus ssh shell (Merlin 376.45 firmware) I'm able to ping out to ipv6 addresses just fine:

admin@RT-AC68U:/tmp/home/root# ping6 www.apple.com
PING www.apple.com (2600:1406:1f:39a::c77): 56 data bytes
64 bytes from 2600:1406:1f:39a::c77: seq=0 ttl=57 time=20.898 ms
64 bytes from 2600:1406:1f:39a::c77: seq=1 ttl=57 time=20.960 ms

But from any connected PC/tablet/device/etc, I cannot ping past the router. I have tried to set DHCP-PD on and off, with a private IPv6 address of fc00::1 and I can ping the router, but nothing past that.

C:\Windows\System32>ping -6 fc00::1

Pinging fc00::1 with 32 bytes of data:
Reply from fc00::1: time<1ms
Reply from fc00::1: time<1ms
Reply from fc00::1: time<1ms
Reply from fc00::1: time<1ms

Ping statistics for fc00::1:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms

C:\Windows\System32>ping -6 www.apple.com

Pinging e3191.dscc.akamaiedge.net [2600:1406:1a:3a2::c77] with 32 bytes of data:

Request timed out.

Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller
Physical Address. . . . . . . . . : 50-46-5D-67-32-A8
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : fc00::1003(Preferred)
Lease Obtained. . . . . . . . . . : Saturday, August 30, 2014 10:40:03 PM
Lease Expires . . . . . . . . . . : Sunday, August 31, 2014 10:40:03 PM
Link-local IPv6 Address . . . . . : fe80::3d36:ce1c:1f7c:5c0c%10(Preferred)


Is there some trick to turning on IPv6 Routing? Some FW rule that needs to be enabled, etc?

 

[yoleska]

A traceroute also shows it stops at the router:

C:\Windows\System32>tracert -6 ipv6.google.com

Tracing route to ipv6.l.google.com [2607:f8b0:400e:c04::64]
over a maximum of 30 hops:

1 1 ms <1 ms <1 ms RT-AC68U-9F20 [fc00::1]
2 * * * Request timed out.
3 * * * Request timed out.
4

I also tried disabling the IPv6 firewall, just for SnG and it still won't work.

 

[yoleska]

Well not sure if it matters, but after turning DHCP-PD back on and disabling the "Enable DHCP6 Server" option and rebooting, it's working now!


C:\Windows\System32>ping -6 ipv6.google.com

Pinging ipv6.l.google.com [2607:f8b0:4005:802::1002] with 32 bytes of data:
Reply from 2607:f8b0:4005:802::1002: time=13ms
Reply from 2607:f8b0:4005:802::1002: time=13ms
Reply from 2607:f8b0:4005:802::1002: time=13ms

Ping statistics for 2607:f8b0:4005:802::1002:
Packets: Sent = 3, Received = 3, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 13ms, Maximum = 13ms, Average = 13ms
Control-C
^C
C:\Windows\System32>

Very strange, but maybe helpful to others that encounter this problem.

BTW, my ISP is Comcast in the Bay Area, California.