[SASAG] Comcast & IPV6 + Dlink router - positive update

[Kurt Buff]

Sorry for the late reply, and very glad you got it working and shared
your results!

Regarding the fe80 address - all hosts will always have one,
regardless of whether it has a routable address, or even a ULA
address. I didn't take the time to find the correct RFC (it's probably
either 3297 or 4291), but here's what wikipedia has to say:
https://en.wikipedia.org/wiki/IPv6_address#Local_addresses
     "A link-local address is required on every IPv6-enabled interface—in other
     words, applications may rely on the existence of a link-local address even
     when there is no IPv6 routing. These addresses are comparable to the
     auto-configuration addresses 169.254.0.0/16 of IPv4"

See also:
https://en.wikipedia.org/wiki/Link-local_address

I can't remember if you mentioned what OS you're using, but here's an
illustrative snippet from my ipconfig on my work win7 machine (but I
don't have ISP-assigned IP addresses - what you see is part of the
MSFT DirectAccess configuration - the relevant idea is that each
interface has multiple ipv6 addresses, including link-local):

Tunnel adapter iphttpsinterface:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : iphttpsinterface
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   IPv6 Address. . . . . . . . . . . :
2002:4332:7626:8100:df6:d5ae:e735:175c(Preferred)
   Temporary IPv6 Address. . . . . . :
2002:4332:7626:8100:28ec:726:3b93:22a5(Preferred)
   Temporary IPv6 Address. . . . . . :
2002:4332:7626:8100:f5d5:a4df:ccb1:d04a(Deprecated)
   Link-local IPv6 Address . . . . . : fe80::df6:d5ae:e735:175c%23(Preferred)
   Default Gateway . . . . . . . . . : fe80::9db4:b4b8:4d8e:a50d%23
   DHCPv6 IAID . . . . . . . . . . . : 671088640
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1C-48-67-33-F0-1F-AF-2F-53-C2
   NetBIOS over Tcpip. . . . . . . . : Disabled

Tunnel adapter Teredo Tunneling Pseudo-Interface:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   IPv6 Address. . . . . . . . . . . :
2001:0:4332:7626:2c23:3ec4:bc5f:f480(Preferred)
   Link-local IPv6 Address . . . . . : fe80::2c23:3ec4:bc5f:f480%24(Preferred)
   Default Gateway . . . . . . . . . :
   DHCPv6 IAID . . . . . . . . . . . : 436207616
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1C-48-67-33-F0-1F-AF-2F-53-C2
   NetBIOS over Tcpip. . . . . . . . : Disabled


Kurt


On Wed, Nov 11, 2015 at 8:47 PM, Bill Levering <idbill at planx.com> wrote:
> Ok… I got it working. Futz with it long enough and you can sometimes get it to work.
>
> This page had some of the answers I was looking for:
> http://forums.xfinity.com/t5/Basic-Internet-Connectivity-And/IPv6-Troubleshooting-Comcast-IPv6-Start-Here/td-p/1492357
>
> This is what I ended up with:
> allow incoming ICMPv6 (I’ve read other places that this isn’t required, dunno)
> set IPv6 WAN DHCPv6 to stateless with prefix delegation (which I believe got the correct prefix auto added to my Advertisement Prefixes)
>
> I was able to ferret out the correct LAN TCP/IP Address from the LAN status page.
>
> The Remote prefix is 2001:558...
> but the advertisement prefix is 2601:602…
> the router still shows fe80::..
>
> Maybe this has to do with how the router filters traffic, by forcing all traffic to go thru it.
>
> Hopefully someone else can use this info.
>
> Bill
>
>> On Nov 10, 2015, at 3:53 PM, Bill Levering <idbill at planx.com> wrote:
>>
>> Maybe someone can shed light on this, with more info.
>>
>> I’m getting an IPV6 assignment of:
>> 2001:558:600a:66:59a2:c996:56a6:7cb3
>>
>> but on the IPV6 LAN settings page, under TCP/IP Setup, it asks for the IPV6 Address. ?
>>
>> I thought that the address assigned to me via the ISP is the address that the router would be… and the 1st 4 segments (aka 64 bit prefix) would be shared among all the devices on my network, with the last 4 segments self assigned using various info and the mac address of the network card. With this in mind, I put the address above in the setting field.
>>
>> If this is not the case, then what IPV6 address should I use? (The router default is fec::1 )
>>
>> I have DHCPv6 enabled as ‘stateful’, which appears to be the only way that the IPV6 dns gets propagated to my machine.
>>
>> And the RA daemon is enabled with only the ‘Other’ flag on.
>>
>> I don’t have any Advertisement prefixes added because I assume that whatever matches the Router address would be advertised.
>>
>> Only if I add an Advertisement prefix does an IPV6 address get assigned to my machine… but I still get a link-local router address.
>>
>> Bill
>>
>>
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