[ipv6-wg] IPv6 cloud!

Hi Ole and list,

"Ole Troan (otroan)" <otroan at cisco.com> writes:

>> Considering the increasing reports of people having problems with
>> DS-Lite 
>
> Any more details on that?
> New problems not mentioned in RFC6269?

sorry I haven't got the time right now to review RFC6269 for what's
exactly mentioned there and what isn't, but: When I do IPv6 trainings
these days it's about one in eight who is struggling with their land
line access, which is based on DS-Lite and which reasonably well matches
the estimated percentage of DS-Lite on land lines.  The problems are
however of a somewhat different nature than what RFC6269 addresses; they
are roughly these:

- Various services don't work.  Like STUN, and due to that, SIP.  And
  apparently various VPN solutions, too, but I never got access to any
  details with this.  The real culprit here seems to be restricted cone
  NAT in the AFTR, plus apparently IPsec not working through DS-Lite.

- There have been multiple reports that during peak hours there are
  significant connection drops.  The impact varies from user to user as
  well as from ISP to ISP, apparently.  Or as one user put it: "I solved
  the problem.  I just don't even try to access IPv4-only web pages on
  saturday afternoons any longer."

  I don't have access to the AFTRs involved, so I can't reliably tell
  what's happening there, but from the descriptions I got it looks like
  some of them are actually running out of memory/CAM during peak hours
  and start to drop the connections.  This is economically plausible,
  too, since the ISPs won't spend significant money on AFTR hardware
  until problems have already shown up.

- First level support is frequently completely helpless when confronted
  with DS-Lite, or even IPv6 in general.

  The most annoying aspect here is that frequently it comes across that
  "it's a problem with IPv6" and "if you keep complaining they'll switch
  it off again for you" (i.e. they go back to IPv4-only connectivity
  without restricted cone NAT).

All the information I have here is largely based on anecdotal reports,
but enough of them for me to consider these problems anything but
isolated cases.


Cheers,

    Benedikt

-- 
Benedikt Stockebrand,                   Stepladder IT Training+Consulting
Dipl.-Inform.                           http://www.stepladder-it.com/

          Business Grade IPv6 --- Consulting, Training, Projects

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