Comcast native ipv6 for network devices.


  • LAYER 8 Global Moderator

    spoke too soon.  Just did a reboot of pfsense, and now no route and

    ping6 ipv6.google.com
    ping6: UDP connect: No route to host

    So is this something wrong with pfsense, or comcast just not sending RA's – I have to guess no RA's since shouldn't I see them with a simple tcpdump?



  • tcpdump again.

    you could technically avoid RA issues at this point by setting the default gw to default  fe80::201:5cff:fe31:da01%em1  UGS        em1


  • LAYER 8 Global Moderator

    That sure and the hell does not seem like a fix to me..  When it was working from pfsense, my clients were not working for starters.

    A better fix would be to just go back to my tunnel ;)

    And is it really common practice for my gateway to be linklocal?  Then why give my interface a global address??  Shouldn't I have a global gateway address to match up with my /128?

    I just do not get why they can not just freaking hand out the gateway via dhcp??



  • @johnpoz:

    That sure and the hell does not seem like a fix to me..  When it was working from pfsense, my clients were not working for starters.

    How is it not a valid fix? Did you add the correct firewalls to pass v6 traffic?

    A better fix would be to just go back to my tunnel ;)

    Have you tried just installing a new build without any previous tunnel configuration?

    And is it really common practice for my gateway to be linklocal?  Then why give my interface a global address??  Shouldn't I have a global gateway address to match up with my /128?

    Yes.

    I just do not get why they can not just freaking hand out the gateway via dhcp??

    It's not. Worked out the box for me. You do realize that DHCPv6 doesn't have an option to hand out a gateway. …that's why RA is used.

    Edit: Maybe the best solution is plug a laptop directly into the modem and run tcpdump. You'll be able to verify RAs.


  • LAYER 8 Global Moderator

    I am aware that dhcpv6 does not hand out gateway!  Just ranting here - don't understand why it was removed, why not leave it as an option?

    Its not a fix, because setting a static gateway like that – that might change is not a good idea!  If it was my network and knew it wasn't going to change then sure.  But I have no idea what comcast might do next week.

    Plugging a box directly into my modem is a great idea, because what I can tell you is not seeing any RA's for sure currently.


  • LAYER 8 Global Moderator

    Ok I plugged 2 different boxes into my modem, and yes rebooted modem between changing them.  Got online with ipv4 no issues.

    But linux didn't even get an IP via dhcpv6, and with tcpdump did not see any RAs - using radvdump nothing.  Connected a win 7 box, got an ip - and even pointed at ipv6 dns, but couldn't talk to them ;)

    Seems native ipv6 here in schaumburg is not yet ready for prime time!  Back to my nice stable HE tunnel I guess



  • Sounds like you've confirmed it is a 100% a Comcast issue having to do with a partial deployment. You should reach back out to NetDog and let him know you can get DHCPv6 but don't see any RA at all.


  • LAYER 8 Global Moderator

    yup have a couple of PMs out to him, and have a post in the direct comcast forum on dslreports.



  • I think the headend is not sending out RA, but the dhcp6 server/relay at the headend is already active.

    But without RA that means delivering broken IPv6. Sort off, the missing default route means it fails fast, but still.



  • @johnpoz:

    Yeah more than willing to give access to take a look..  Just PM me when would be good time for you to access, and I can send you the info to remote in.

    I have got a comcast guy on another forum checking for sure if should be available in my area.

    I run the IPv6 program for Comcast, I will try to help.

    @johnpoz:

    As to screen shots and what em – they might of swapped because I was using 2 different vms in testing this.  I had a clean vm that wasn't working and then was playing with it again on my normal vm.  So those 2 vms might be swapped for which em is wan and which is lan, etc.  Would have to double check that.

    edit:
    So if you see in the screenshots I posted I was getting Ips -- but just couldn't get anywhere, I didn't see a default route for ipv6.  But looking forward to your PM on your schedule - I should be available tonight, few hours from now to switch it over to my clean install with no tunnel setup -- can let you in for sure to take a look.  Would really really appreciate that!

    If you have time now I could remotely turn on remote access and let you in to current setup with HE tunnel setup, etc.  And you could play with that.  Don't care too much if you break the tunnel setup.  Doesn't matter if loose the tunnel that is currently setup, would like to go native anyway ;)

    edit2:  Got your PM, thanks once I hear back from the comcast guy that its suppose to be there I will let you know.  But what I am thinking is it's not there yet?

    So this is my normal vm, I turned off the HE tunnel.  Updated to the latest and greatest snap

    2.1-BETA0 (i386)
    built on Tue Jun 19 20:53:56 EDT 2012
    FreeBSD 8.3-RELEASE-p3

    I then run gitsysnc this morning to be sure.  Deleted my HE tunnel stuff, set wan to dhcp6, prefix delegation 64.  Then set Lan to track and 0 for prefix ID.  Rebooted.

    As you can see from screenshot I get a /128 and shows a /64 on my lan.. But just don't get a route out on ipv6 -- so I have highlighted that yes my wan is em1, and let a tcpdump -i em1 -vv ip6 run for like 5 minutes or so and just don't see anything!  I should be seeing RA should I not?  There should be some in a 5 minute period I would think ;)

    by default we reply to a router requesting an IANA and IAPD with a /128 and /64.  You should see RAs more frequently than 5m.

    @johnpoz:

    So my guess is something is not turned on at my isp for native to work yet for me.  Once I hear back from the comcast guy on another forum that is checking with my modem mac and still nothing working I will let you know and more than happy to let you in.  Happy to let you in now if you want.

    you can contact me offline, I can verify if IPv6 has been launched in your area.



  • @whfsdude:

    johnpoz,

    Reach out in the Comcast forums on dslreports.com. It looks like they've set up DHCPv6 without RA. Just checking though, you've got a DOCSIS3 modem, right?

    we use RAs + stateful DHCPv6.  IPv6 auto-configuration is not supported.



  • @johnpoz:

    Yup SB6120, and have PM out to netdog on that site, he responded already once - but seems I only game him the CMTS-MAC, when he needed the CM-MAC?  So now I have sent him everything I could see from the modem with any sort of mac in it ;)

    6120 is good to go, CMMAC or account # sent privately both work.



  • @johnpoz:

    so I heard back from netdog

    8m : 2012-06-20 15:33:59 : From NetDog See Profile delete · mark-unread · keep
    The CMTS your on supports IPv6 and I can see leases going out to other customers on the DHCP server.

    but I responded back to him that not seeing any RAs and no default route.

    you should be learning the default route from the RAs sent by my CMTS.



  • @johnpoz:

    That sure and the hell does not seem like a fix to me..  When it was working from pfsense, my clients were not working for starters.

    A better fix would be to just go back to my tunnel ;)

    And is it really common practice for my gateway to be linklocal?  Then why give my interface a global address??  Shouldn't I have a global gateway address to match up with my /128?

    I just do not get why they can not just freaking hand out the gateway via dhcp??

    this would be a step backwards no?



  • @johnpoz:

    I am aware that dhcpv6 does not hand out gateway!  Just ranting here - don't understand why it was removed, why not leave it as an option?

    Its not a fix, because setting a static gateway like that – that might change is not a good idea!  If it was my network and knew it wasn't going to change then sure.  But I have no idea what comcast might do next week.

    Plugging a box directly into my modem is a great idea, because what I can tell you is not seeing any RA's for sure currently.

    [jjmb] I also co-chair the IETF dhcwg, there is talk about adding this option.  This is being heavily debated and even if it becomes available it does not mean people will use it.



  • Thanks for joining the forum, John. Much appreciate having your feedback and expertise shared here.

    For those who don't know, that's John Brzozowski. Chief Architect, IPv6 and Distinguished Engineer at Comcast. Also a chair/co-chair of some major IPv6 working groups, a true authority on the subject.


  • LAYER 8 Global Moderator

    hehe - that is awesome, but I think he need a little work on his forum use.

    he has his comments inside the quote markers - at first glance it looked like he was just quoting without making any comments ;)



  • @johnpoz:

    hehe - that is awesome, but I think he need a little work on his forum use.

    he has his comments inside the quote markers - at first glance it looked like he was just quoting without making any comments ;)

    Dang kids and their forums these days… ;D Forums made me feel old back when we opened this site and I was 25 at the time. I edited his posts to properly quote.


  • LAYER 8 Global Moderator

    Forums make you feel old? ;)  You remember the old FIDOnet?

    That use to be the sweetsuff when you could get a reply from someone in Japan in less than 24 yours..



  • Hey John,

    When are you guys planning on rolling IPv6 out to Business Class customers? I've been dying to implement IPv6 at work haha. We have a SMCD3G-CCR modem, which doesn't appear to be certified for IPv6 yet on your mydeviceinfo site.

    Thanks,
    Derek


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