CGN :: Observations & Recommendations

by Chris Grundemann on 04/26/2012

The 2012 North American IPv6 Summit has come and gone but requests for my slides from the third day continue to roll in. So I’ve decided, as I often do, to post them up here. My talk “Carrier Grade NAT – Observations and Recommendations” was given as part of the “IPv6 Transition and IPv6 in the Home” Track on day 3 of the Summit. In it, I cover as much of our work here at CableLabs around CGN/LSN that I could squeeze into 45 minutes. I start with a brief overview of what NAT and CGN/LSN are and how they work. Then I report on the testing that CableLabs has conducted on CGN/LSN over the past two plus years, and on the challenges we’ve discovered. Next I cover many of the workarounds, mitigations and potential solutions to those challenges, including some novel ideas invented at CableLabs. I wrapped up my talk with some conclusions and parting recommendations. Enough of me yammering though – the slides should give you a decent understanding of what I presented:

A few things before I let you go:

First, slides 7 and 8 rely heavily on animation to describe the workings of a NAT444 and a DS-Lite deployment respectively. To make that a little clearer without the animations, here are the two graphics rebuilt for static viewing:

Second, if you’d like the rest of the story on CGN (all the details not in the slides), give me a shout – perhaps I can come give this talk at your event as well. This of course goes for any of the talks you may have seen me give and slides I may have posted.

Finally, as always, your comments, questions, suggestions, and other feedback is very welcome. Did I get something wrong? Miss something? Bore you? Blow your mind? Let me know!

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{ 10 comments… read them below or add one }

Alaa 04/27/2012 at 09:29

Great work Chris. Keep IPv6 rocks ! I wonder if it OK to download the slides ? How please?



Chris Grundemann 04/27/2012 at 09:48

Thank you!

The Rocky Mountain IPv6 Task Force is selling recordings of the entire Summit: The slides themselves should be available on the RMv6TF website in the next couple weeks: In the mean time, check your inbox! ;-)


Christopher Cain 04/27/2012 at 13:15

Chris – great presentation. I you could send a copy of the slide deck my way as well, I would greatly appreciate it.



Chris Grundemann 04/27/2012 at 13:39

Since you made your request via IPv6, I’d have a hard time saying no. =)


Arturo Servin 04/27/2012 at 14:48

Very nice presentation. I liked a lot because it shows the problem as it is, without any “religious” arguments.



Chris Grundemann 04/27/2012 at 14:58

Thanks Arturo!


Matt Rowley 04/30/2012 at 13:39

Very good presentation, thanks for posting the slides.
So, tongue-in-cheek summary:
Last-mile ISPs don’t want to bother with IPv6 because it means replacing CPE stuff… cable modems, routers, etc.
So enter CGN, which breaks stuff left and right.
So fix that with PCP, which requires a new CPE router.
GOTO 1 ? :)


Chris Grundemann 05/24/2012 at 15:37

precisely =)


Raj Jayaraman 04/30/2012 at 23:23

Dear Chris,

Great set of slides. Would appreciate if you could email me across the same.

Best Wishes,
Raj Jayaraman.


Youssef 05/08/2012 at 05:47

Hi Chris,

Can I have copy from the presentation?


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