Question about IPv6 Connectivity

[ohheckyeah]

My router has IPv6 enabled, my modem has IPv6 capability, but when I check at the Test your IPv6 website, it says I don't have IPv6 connectivity.

Can anyone guide me to a fix for this?

[dballance]

1. What does your service provider say? Do you have an IPv6 address for your site?

Does your provider support IPv6 and did you get both an IPv4 and IPv6 address if they do? After you find that out then did you configure your router and server to route and process IPv6 traffic?

[ohheckyeah]

2. Thank you for your reply.

I changed my router setting to 6to4 tunnel instead of auto detect and I now have IPv6 connectivity but evidently that is a hit or miss thing and not recommended.

The regular tech people at Comcast didn't know what the hell I was talking about, just said you only need IPv4. The signature tech people charge so I decided to ask here.

I tried autodetect and that didn't work.

[dballance]

3. So you have Comcast business service with a static v6 IP?

I haven't worked with IPv6 but doubt the principles are that different from v4. I don't doubt the people at Comcast are idiots. Most first-level people are not well trained and it takes forever to get to someone who knows what they're talking about. If you're on a business service though they really should know v6 exists.

Do you have a link to your router's manual on the vendor site that I could read? I would assume you'd be able to assign multiple addresses to the external (WAN) interface of your router so you can get a v6 and v4 address working simultaneously.

If the 6to4 tunneling on the router worked that would make me think you have the proper v4 and v6 addresses with Comcast and their modem is passing the traffic through to your router. Then I'd start looking at your router and server interfaces with respect to their configuration and the router IP configuration on the LAN side. And don't forget the router firewall settings. You need to make sure the firewall in the router is not blocking v6 traffic. You may have to enable that or add some rules or both to get that configured.

If the modem and router are passing the traffic you still need your server to be able to accept that. Tunneling would translate the v6 to a v4 address to get it to your server. If you're passing the v6 straight through (subject to firewall rules) then your server has to have an interface configured for v6 too.



Why is 6to4 tunneling hit or miss? Was this from your router manufacturer? Companies have been done address translation decades now. I can't immediately understand why it should be unreliable.

I hope I'm being helpful and not insulting. I don't know your level of network config experience and I'm making some assumptions based on my v4 experience. I'll do some googling. I need to know this stuff anyway as v6 becomes more and more used. I haven't really heard it's taking over yet.

[ohheckyeah]

4. No, I don't have business service.

The 6to4 tunnel was not recommended at the website Test Your IPv6.

You are being helpful and I'm not insulted. I know very little about this - what brought it up was an error message in my event viewer. It showed a failed attempt to get an IPv6 address....I saw that and started investigating IPv6 because I'm the curious sort.

Here is the manual to my router:

ftp://downloads.netgear.com/files/WNDR3300v2_SM_25MAR2010.pdf

I'll check the firewall setting.

[dballance]

6. Well, that manual stinks.

I looked at a couple of other sites: you might try this one: http://forums.comcast.com/t5/Home-Networking-Router-WiFi/Evidence-of-Comcast-IPv6-CPE-Dual-Stack-CPE-and-CPEPD/td-p/1295481/page/3

If you're a residential user you really shouldn't need v6 yet. You should be able to get to most everything people use with v4 still. If you truly must have v6 due to sites you're connecting to that are v6-only then I'd go back to 6to4 tunnel. If you get lots of errors or cannot connect I'd e-mail netgear. I've had good luck with them.

Oh, I did see this on one of the sites:

But there was one last hurdle: Comcast. While IPs had configured fine, I couldn’t reach anywhere. I spent roughly 30 minutes reviewing all configuration settings, making sure I had routes, and rebooting everything a few times to no avail. Finally gave in, called back Comcast, and the tech was like “oh, let me disable the firewall on our side.” POOF! Everything worked. So Comcast residential IPv6 is definitely live in my area, and just needed a new shiny DOCSIS 3.x modem.

and this - which I've had issues with and I use a netgear wnr2000v3:

Forums indicated that a common issue is that routers/modems have incompatible asynchronous boot up sequences, e.g. IPv6 is ready on one before the other and they establish DHCP improperly as a result.

What (I think) eventually worked for me was turning off both, allowing the router to fully boot and wait a FULL couple of minutes, then boot up the modem, which will then realize it needs IPv6 for a whole network not just one client. My interpretation of what happened, at least.

I happen to also have turned on IPv6 ULA when I did this, but that does not appear to be getting utilized from what I can tell. I’m not even clear what that does.

[ohheckyeah]

9. I called Comcast and they were no help but

I posted on the Comcast forum to see if they could tell me something. I'm going to try unplugging the modem, rebooting the router, plugging the modem back and and see what happens.

Thanks!

[ohheckyeah]

7. They don't say shit.....

Nobody could answer me unless I paid for support which is bullshit. I don't think they do support IPv6 in my area but that's just what I'm deducing from reading the Comcast forums. The 6to4 tunnel allows me to connect to IPv6 via that service.

Yes, I tried configuring the router but the only way it works is to use the tunnel. The other configuration options give me an address but it doesn't actually work.

[ohheckyeah]

5. Here's what I think the deal is.

Comcast isn't offering IPv6 in my area yet. The 6to4 Tunnel allows me to connect to IPv6 via an outside service, but the service is unmanaged and can be unreliable.

So, in order not to get the IPv6 address error, I can either use the 6to4 Tunnel, or I can disable IPv6 in my network connection and router.

Does that sound about right?

[dballance]

8. I dunno. If you ran the IP readiness test and got 10/10

It should be in your area.

[ohheckyeah]

10. I got 7 out of 10.

Then the message about the 6to4 tunnel not being reliable.

[bananas]

11. try dslreports.com

They have forums specific to ipv6 and forums specific to isps.

They also have tech people from the isps who sometimes jump in to answer questions.

For example here's a thread about comcast. in the ipv6 forum
http://www.dslreports.com/forum/r28195454-IPV6-Comcast-ASUS-RT-AC66U-

And here's a thread about ipv6 in the comcast forum
http://www.dslreports.com/forum/r28121407-IPv6-IPv6-Routers-Tested-with-User-Guides.

[ohheckyeah]

12. thank you. n/t