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“Comcast signs first IPv6 corporate customer” ... so what?

Network World has recently published another “breaking news” article: Comcast has connected its first corporate customer to its dual-stack IPv4/IPv6 service. Let me try to put the news in perspective:

  • We (NIL Data Communications) were able to find two ISPs with production-grade dual-stack IPv4/IPv6 service in Slovenia (a country with 2 million people, which puts us somewhere between Manhattan and Queens).
  • We’ve got PI address space from RIPE a year ago.
  • We’ve been multihomed (via BGP) to both service providers for months.

So, what is Network World trying to tell us?

For more information on IPv6 in Service Provider and Enterprise networks, check out my webinars and workshops: Market Trends in Service Provider Networks, Building IPv6 Service Provider Core and Enterprise IPv6 deployment.

Disclaimer: I am not trying to bash Comcast in any way. I know they’ve been among the first to realize IPv6 potential and have invested heavily in IPv6 infrastructure and technologies (DS-Lite efforts were started by Comcast).


  1. >>So, what is Network World trying to tell us?

    That we outside the US dont exist? >:o
  2. >So, what is Network World trying to tell us?

    They own shares of Comcast they want to unload?

  3. Probably that the 800lb gorilla of consumer / small commercial IPv4 providers in the US is committed to v6, and that they are bringing v6 access to market.

    I think most of us tech folk knew of their plans, but it's good press for both Comcast and IPv6.
  4. Hi Ivan,

    your site ( seems to be preferring IPv4 over IPv6. At least this is what I get when connecting via a SIXXS tunnel. I also couldn't find an AAAA record for
  5. Use ;)
  6. Pipi, you nailed it this time :) I think you are a bit spoled, because you live in Slovenia, according to RIPE most prepared country for v6 in european region... no accident that google wants slovenians to speak at their v6 implemetors conference :) *joke*

    Seriously, whatever who may think, we are walking the walk in v6, not just talking the talk.

  7. (typo) spoled=spoiled
  8. What is the criteria for callin a network IPv6 production-ready?

    -provider IPv6 competence?
    -provision systems?
    -equal IPv4/IPv6 services : Firewall, load-balancing, web, MPLS VPN, other?

    Hope to be able to call our implementation production-ready, but not sure at all. (three star RIPE readiness)

  9. Well, as Jan Zorz is proudly pointing out at every opportunity, Slovenia has the highest percentage of 4-star (on the IPv6 RIPEness scale) LIRs:

    For me, production-ready IPv6 (in commercial/enterprise environment) would include transit IPv6 connectivity with native upstreams, provisioning and IPv6-competent support staff.

    DNS is irrelevant, as we must have PI space (multihoming), E-mail is irrelevant as we're not using providers as mail relays, web hosting is irrelevant for most enterprise customers.

    For residential users, you obviously need DNS, web and e-mail, which opens the whole "hosting/content" can of worms: firewalls, load balancers ...

    6VPE is (in my opinion) relevant only to the very few enterprises that have actually deployed end-to-end IPv6 in their enterprise networks.
  10. Happy to say then that our implementation are production-ready.

    Dual-stack on all peerings (where possible)
    Competent support staff

    Whenever there is a new internet access configuration, customer will as default be assigned an /48 and dual-stacked.
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