Get superfast AT&T Fiber internet
markmcclain's profile

New Member

 • 

2 Messages

Saturday, February 17th, 2024 1:10 AM

No IPv6 Default Route

I've tried call in support multiple times with no luck about IPv6 being broken. My router gets a global IPv6 unicast address, but does have not a default IPv6 gateway. Since there's no default gateway the router cannot forward IPv6 traffic. I've tried the built IPv6 ping to well know domains and those fail. I've verified with other ATT subscribers that they do have a default IPv6 gateway when viewing their broadband status.

To short circuit the automated responses... I've called the support multiple times so I've already done the following:

- restarted the device
- performed a factory reset
- had support send me a new gateway
- had support roll a truck (The tech was confused about the problem and called his boss who said they don't offer IPv6!).

I'm not doing anything fancy, but I do want IPv6 to work via the ATT provided router!  Is there a magic request to speak with anyone ATT who can actually speak basic IPv6 networking?  My hunch is this is likely a config issue that can be resolved remotely by a knowledgeable person.

ACE - Expert

 • 

35K Messages

2 months ago

What does it say HERE for IPv6 Status?

New Member

 • 

2 Messages

2 months ago

I've disabled IPv6 on the home side of the network. It breaks applications on the LAN side . Devices would correctly configure IPv6 and then applications attempted to use it. The connections would fail on timeouts delaying the fallback attempt to IPv4 ( slowing browser sessions).

Here's the tcpdump showing traceroute to google dying at the router with destination unreachable.

20:36:07.288307 IP6 2600:1700:xxxx:nnn::1 > 2600:1700:xxxx:nnn::22: ICMP6, destination unreachable, unreachable route 2607:f8b0:4002:c1b::65, length 68

Community Support

 • 

231.3K Messages

2 months ago

Hi @markmcclain,

Thank you for reaching out to us!

We hear you and let's guide you to the right direction!

We would recommend you to follow this article to check the compatibility of IPv6.

Also, please follow the below steps to enable IPv6 on your Windows 10 computer:

1. On the Start screen, type Control Panel.

2. Press Enter.

3. Select Network and Internet.

4. Select Set up a new connection or network.

5. Select Next.

6. On the left side of the Network and Sharing Center, select Change Adapter Settings.

7. Right-click your network connection.

8. Select Properties.

9. Scroll to Internet Protocol version 6.

10. Check the Internet Protocol Version 6 (TCP/IPv6) box.

11. Select OK to save your changes for the selected network adapter.
We hope the above information is helpful. If you have any additional concerns, please feel free to reach out to us!

Thank you,

Sarah, AT&T Community Specialist.

ACE - Expert

 • 

35K Messages

2 months ago

Sarah... he's got IPv6 turned off on the Gateway at the moment.  Turning IPv6 on his PC is not a thing that needs to be considered at this point.

@markmcclain , yes, I also have IPv6 turned off on my Gateway and I do still have a default Gateway for IPv6.  You're probably right that the device's configuration record is probably messed up, but... I have no idea how you get that fixed if rolling a truck and getting the tech to call it in didn't work.  You might have to try BBB or FCC complaint to get a call from the Office of the President.

Tutor

 • 

11 Messages

17 days ago

I get a Gateway and can run an IPV6 test on the web and it passes but AT&T is not assigning Primary and Secondary DNS for IPV6 so I'm getting delays and momentary err_connection_reset errors as Windows 11 defaults to first trying to do a DNS lookup using IPV6 then fails over to IPV4.  The only solution is to turn off IPV6 in Windows.  At one point I entered the Google IPV6 DNS Server addresses manually in windows and the nslookup command from the command line resolved using the IPV6 DNS address but then it started failing again.  

Not finding what you're looking for?
New to AT&T Community?
New to the AT&T Community? Start by visiting the Community How-To.
New to the AT&T Community?
Visit the Community How-To.