[SASAG] Comcast & IPV6 + Dlink router

Bill Levering idbill at planx.com
Mon Nov 9 19:31:32 PST 2015

Hmm… seems like maybe it’s a Comcast issue. 

The comcast6.net website hasn’t been updated in over a year, and the deployment FAQ is from 2012.

This is listed as my gateways on the router:

Gateway, fe80::223:ebff:fe77:92e2 

and this shows up in the ipv6 routing table on the router:
::/0                                        fe80::223:ebff:fe77:92e2                UGDA  1024   27       0 eth1    
::/0                                        fe80::c612:f5ff:feed:d932               UGDA  1024   661       0 bdg1    

So, my guess, is the fe80 address is coming from comcast.


> On Nov 9, 2015, at 5:24 PM, Benjamin Cline <brc at peppermint.org> wrote:
> That fe80::/64 address you're seeing is an IPv6 link-local address, it sounds like you're not getting a valid routable IPv6 subnet assigned to the LAN side.
> I have a similar setup and at one point I was able to get Comcast to assign a routable /64 to my lan via DHCP-PD[1], but that stopped working after about a month and I wasn't able to get it fixed. I considered it unlikely I'd be able to get through to someone who actually understood my problem and could fix it, so I didn't bother calling support.
> [1] https://en.wikipedia.org/wiki/Prefix_delegation
> On Mon, 9 Nov 2015, Bill Levering wrote:
>> So… I upgraded to a D-Link DSR-250 router and was hoping to get IPV6 working.
>> It appears that the router is getting an IPV6 address, and I can ping IPV6 addresses from it, but I can’t reach anything from my Mac.
>> Comcast support tells me that they don’t support IPV6!
>> All the D-Link pages I’ve found don’t show 1/4 of the options I have available to me.
>> Such as:
>> - IPV6 WAN settings
>> - IPV6 LAN settings
>> - Router Advertisement
>> - Advertisement Prefixes
>> - Prefixes for Prefix Delegation
>> My gateway appears to be: fe80::c612:f5ff:feed:d932%en0
>> which makes me think it is hitting localhost on the router.
>> I think it is probably something in my config, but I don’t know where to start.
>> Any ideas?
>> Bill
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> -- 
> Benjamin R. Cline
> brc at peppermint dot org

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