 NetDogPremium,VIP
join:2002-03-04
Parker, CO
kudos:4
 ·Comcast
4 edits | [IPv6] Troubleshooting Comcast IPv6 (Start Here)
Router Support |
Arris looks likes something like this:
DHCP Attempts to obtain CM IP Address:
IPv4 Attempt(s) 3
IPv6 Attempt(s) 0
MDD IP mode Override Mode=0;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
some others say MDD or MIMO setting.
All these settings are for the CM side\DOCSIS side\CM Management side of the cable modem. It doesnt mean anything to the user other then the MSO is using IPv4 or IPv6 to manage your cable modem.
First check for cable modem support
You will need to make sure your cable modem supports CPE IPv6. Go here to check for support:
»mydeviceinfo.comcast.net/?s=i&so···1&sc=513
Make sure your cable modem has a check box in the IPv6 tab.
Next to check if you have native IPv6 via Comcast or not.
If you have a desktop that supports DHCPv6 plug in the desktop directly into the cable modem and see if you get a IPv6 address. Here is a small list of OS's I know that support DHCPv6; Windows Vista\7, Latest version of MAC OS, and Linux I got a version of fedora dhcp client to work.
Plug in the OS and A) look at the interface for an IP that starts with 2001:558:[something] or b) goto »test-ipv6.comcast.net/ this will show you both your IPv4 address and your IPv6 address.
If you still dont know you can PM me your cable modem MAC Address (HFC MAC) and I can check on this for you.
Router Support
This is not as easy, Comcast requires DHCPv6 and DHCPv6-PD for router support. Maybe if people post here what routers they got to support maybe we can help out each other..
The router WAN will get a v6 address of 2001:558:[something] and the Prefix Delegation or PD will get 2601:[something]
Please take a look at the picture I have included..
Don't block all ICMPv6 (for the adv users)
I am a big fan of blocking everything and opening only what I really want. But v6 uses ICMPv6 messages to talk ND's, RA's. If you block all ICMPv6 traffic you will block the important communication to get your DHCPv6 address and PD.
Personally I have a Cisco router, I have the link-local address of my CMTS permited for ICMPv6 in the first line of my ACL.
You get a v6 address on both your LAN and WAN but no workie
From the command line do a traceroute or tracert to www.google.com like this:
C:\Users\tuska>tracert www.google.com
Tracing route to www.google.com [2607:f8b0:400f:800::1012]
over a maximum of 30 hops:
1 4 ms 5 ms * 2001:558:(something)::1
2 5 ms 4 ms 5 ms 2001:558:(something)::1
**removed for space**
8 6 ms 6 ms 6 ms xe-5-1-0-0-pe01.910fifteenth.co.ibone.comcast.net [2001:558:0:f8b3::2]
9 6 ms 6 ms 6 ms 2001:559::55e
10 7 ms 6 ms 7 ms 2001:4860::1:0:24db
11 7 ms 7 ms 7 ms 2001:4860:0:1::591
12 7 ms 22 ms 6 ms den03s05-in-x12.1e100.net [2607:f8b0:400f:800::1012]
Trace complete.
If you don't see the first hop check your default route on your desktop, make sure your seeing the RA's.
If you don't see the second hop make sure you router is seeing the default route. (this has been known to be an issue)
If you have a default route but your still not getting past the second hop reset both your router and your cable modem. The CMTS needs to see the DHCP request to add your v6 prefix route back to you. So kicking off a DHCPv6 release\renew from your router should fix this. If you tried the reset and still can't get it ping Comcast at this point.
Questions
Please post here with any questions but if you want me to check for v6 in your service area PM me your cable modem MAC. |
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NetDogPremium,VIP
join:2002-03-04
Parker, CO
kudos:4
1 edit | Routers I know people have used:
Cisco IOS
ASUS RT-N66U
Linksys E4200v2
TomatoUSB with workarounds (see below) |
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 PeeWeePremium
join:2001-10-21
Madera, CA | reply to NetDog
The HFC MAC address? |
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NetDogPremium,VIP
join:2002-03-04
Parker, CO
kudos:4 | Yep.. |
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 graysonfPremium,MVM
join:1999-07-16
Fort Lauderdale, FL | reply to NetDog
Thanks for the explanation.
Your picture of the Home router /128 WAN Interface shows a /64 IP address?
My router is m0n0wall v1.8.1b535. |
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 plencnerbPremium
join:2000-09-25
Elgin, IL
kudos:2 | I agree, thanks for the detailed explanation.
said by graysonf:My router is m0n0wall v1.8.1b535.
I'm currently running Smoothwall Express 3.x, and I know that version does not support IPv6 at all. Doing some research on their forums, it looks like there won't be an official version that does. However, there might be a user mod that will, but I am not 100% positive of that.
So, I'm wondering how m0n0wall compares to Smoothwall, as far as installation and functionally? If I have to change flavors of Linux/Unix to support IPv6, I'll do it, but I don't want to drastic of a change.
--Brian
--
============================
--Brian Plencner
E-Mail: CoasterBrian72Cancer@gmail.com
Note: Kill Cancer to Reply via e-mail |
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graysonfPremium,MVM
join:1999-07-16
Fort Lauderdale, FL | I know next to nothing about Smoothwall so I can't offer any comparison to m0n0wall.
Depending on the hardware you are running Smoothwall on, you could try m0n0wall and see if you like it or not.
They have a Live CD and all you need to store the configuration on is a USB stick or floppy disk. It won't touch your hard drive.
If you don't like it, toss the CD and erase the USB stick. If you do like it you can install it to hard drive.
I run mine on a Compact Flash Drive on headless hardware. |
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 EGThe wings of lovePremium
join:2006-11-18
Union, NJ
kudos:9 | reply to PeeWee
said by PeeWee:The HFC MAC address?
That's the specific *Hybrid Fiber Coax* MAC address that is needed for a modem to be able to be provisioned for service / registered on their system. |
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 tshirtPremium,MVM
join:2004-07-11
Snohomish, WA
kudos:3 | reply to NetDog
I'm just guessing that the northwest (WA, OR,etc) is still on hold? |
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NetDogPremium,VIP
join:2002-03-04
Parker, CO
kudos:4 Reviews:
·Comcast
| reply to graysonf
said by graysonf:Thanks for the explanation.
Your picture of the Home router /128 WAN Interface shows a /64 IP address?
My router is m0n0wall v1.8.1b535.
True I will change that and repost.. I was thinking /128 of a /64 space, but will correct and repost it. |
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NetDogPremium,VIP
join:2002-03-04
Parker, CO
kudos:4 Reviews:
·Comcast
| reply to tshirt
said by tshirt:I'm just guessing that the northwest (WA, OR,etc) is still on hold?
We are working on the Cisco 10K's, here is a quote from »www.comcast6.net/ "IPv6 has been launched on all Arris DOCSIS 3.0 C4 CMTSes, covering over 50% our network. We are targeting completion of the rest of the network by mid-2013." |
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tshirtPremium,MVM
join:2004-07-11
Snohomish, WA
kudos:3 Reviews:
·Comcast
| Ok, We were once told sept 2012, then december-ish.
It's odd that cisco devices weren't better prepared to upgrade given their involvement in IPv6 (and other networky things  )
they do have a cool map tracking world progress
»6lab.cisco.com/stats/index.php |
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AVonGaussPremium
join:2007-11-01
Boynton Beach, FL | Well, since we're jibbing Cisco, I think it's ironic the one's who often indirectly claim to be the leaders in networking are the ones slackin' on IPv6...  |
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| reply to NetDog
Just saw this. I'll repost my findings from the other thread here. Many thanks to NetDog for all the help.
I couldn't get IPv6 working with my RT-N66U. I knew IPv6 was enabled in my neighborhood thanks to NetDog, and it was working fine when my computers were hooked directly to the modem. So the next step was to look at the router. I was on version 260 of the firmware, and even tried downgrading to 220 I believe. Neither worked. So I switched a Merlin build of the ASUS firmware (246.20) and everything is working perfectly now.
You can get the Merlin builds here:
»www.lostrealm.ca/tower/node/79 |
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NetDogPremium,VIP
join:2002-03-04
Parker, CO
kudos:4 | reply to NetDog
I opened this one because a lot of people are asking the same questions. I am hoping I can answer the questions along with educating others. |
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| Yeah, it's a great idea. It'll be nice to have one consolidated discussion on this. |
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| reply to NetDog
I have a Motorola 6121 and an ASUS RT-AC66U with the latest Merlin build and IPV6 works for me on Windows 8 and VirtualBox Ubuntu 12.04 Linux Guest. |
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 koitsuPremium,MVM
join:2002-07-16
Mountain View, CA
kudos:19 | reply to NetDog
And for folks running routers that use TomatoUSB, you'll need these workarounds (no they are still not in any of the Toastman, Shibby, etc. builds):
»[IPv6] TomatoUSB and Comcast IPv6 -- bugs found
--
Making life hard for others since 1977.
I speak for myself and not my employer/affiliates of my employer. |
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 sortofageekNot TroublePremium,Mod
join:2001-08-19
There & Then
kudos:14
Comcast HSI
Comcast Cable TV
Team Helix
Distributed Comput..
Linksys
| reply to NetDog
Thanks, NetDog  . And thanks to Johkal for linking to this topic in a FAQ entry so people can find it again long after the topic scrolls.
»Comcast High Speed Internet FAQ »Troubleshooting Comcast IPv6
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Join Team Helix * I am praying for these friends . |
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 mb
join:2000-07-23
Washington, NJ | reply to NetDog
Linksys E4200v2 |
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