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Tunnel Adapter 6TO4 Adapter

To start I have a simple setup: Windows 8 Desktop with just a DSL modem hooked up to the computer. Up until last week I had a Default Gateway ip address showing when I did an ipconfig command prompt. I thought maybe one of the Windows Updates last week corrupted my settings. So I reformatted the computer without doing any updates. I have the same problem: no gateway address. I noticed there was a problem last week up here in Northern California:

"RESOLVED - 9/12/2013 3:20 AM: Some DSL customers in the AT&T-serviced area of Northern California may encounter difficulty in connecting to the internet. Network engineers are aware and working to resolve the issue. No estimated time to resolution."

I have always had a Connection-specific DNS Suffix (dslextreme.com) and an
IPv6 Address and still do. Is there a chance this problem last week in the AT&T-serviced area of Northern California affecting my problem?

No, that outage was due to a remote terminal that needed repairs, but you're not connected to it. In your case... it looks like your modem is out of sync. If you look at the lights on your modem, is the DSL light flashing or out?

First thing I'd try is a simple powercycle - turn off, wait half a minute, turn back on, see if that DSL light goes steady on. If so, you should be back online... if not, well, continue to the next step.

Next thing to check is kind of a 'brute force' approach - unplug ALL phones in your house. Also, any fax machines or anything else that uses a phone cord. The ONLY thing in the house using a phone cord should be the modem itself, and that phone cord should be short (definitely under 10', shorter is better). Make sure it's not using any filters, either - should go straight from wall to modem. See if the DSL light goes steady on.

DSL light still not steady on? Try swapping out the phone cord for another (short, remember) phone cord.

DSL light STILL not steady on? Try moving the modem to a different phone jack (if needed, you can disconnect the modem for this test).

If the first step (powercycle) fixes it - then modem just hiccuped, or something. Wouldn't worry about it unless it keeps happening.

If second step (unplugging all phones) fixes it - then you probably have a bad filter. Plug phones back in (with their filters), one by one - when you plug in the bad filter, the DSL light will typically go out again.

Third (different cord) and fourth (different jack) are rather self-explanatory.

If you go through all four steps and you STILL don't have a steady on DSL light... then there's probably something wrong with the phone line outside. That outage (which is already resolved) which you mentioned isn't affecting your connection, but it's possible something else could be affecting it. If THAT's the case, then definitely let me know and I'll have a tech call to review the troubleshooting and set up a dispatch if needed.

My modem is fine and all synced up. I am not having trouble with my main IPv4 connection. It is the IPv6 gateway. I cannot use IPv6 Usenet servers unless the IPv6 gateway is populated with an IP address. My IPv4 address is 68.183.27.xxx. The gateway IP is 68.183.127.1. Like I said IPv4 is OK. I need the IPv6 gateway IP to load. Right now it is blank.

Your modem's in sync now, but it certainly wasn't back when I checked earlier today (did you have it turned off, perhaps?).

As far as I know, we aren't using IPv6... nor, for that matter, were we using such previously. Are you saying that you used to be getting an IPv6 gateway from us, and it just recently stopped working?

Do you normally use a router? It's quite possible the router could have supplied an internal IPv6 gateway. Otherwise... I'll have to look into this further.

No just a modem and computer

Ok, got some more information on this. "Tunnel Adapter 6TO4 Adapter" is a software adapter on the computer itself which converts IPv6 packets so they can be used with an IPv4 connection. We do not (and have not) provide IPv6 addresses, just IPv4 addresses, so you definitely weren't getting an IPv6 gateway from us - any IPv6 gateway you were seeing previously was a 'virtual' gateway within the computer itself.

I'm not aware of any changes to our infrastructure recently that would have had any effect on such, but I'll continue digging to see if I can find anything else on it.

I found this link: »test-ipv6.com/faq_6to4.html
Did your network operations center change anything on their end?
I even tried to create a tunnel through Hurricane Electric but they could not ping my IP address even with my firewall off!

Here is another link that I found if the Ipv6 tunnel is broken:
»test-ipv6.com/broken.html

Here is a quote from that page:
"If you set up 6to4"
"Ask your ISP if they offer any IPv6 connectivity (including possibly 6in4 tunnels, or tunnelbroker type tunnels).

A good question for the NOC guys!