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RE: ocean: do not boil
Hi Margaret,
Excellent start to the discussion, thanks.
> I've been thinking about this question and trying to
> come up with a good answer...
>
> I'm actually thinking of this question a bit differently,
> so please tell me if it matches what you are asking:
>
> What is the best way to set-up a network of 10 million
> nodes that all to need access both IPv6-only and IPv4-only
> services?
>
> There are two thoughts that I have about this question:
=> Good questions, I suggest we focus on those
first then look at the different solutions.
>
> (1) It isn't a fully qualified question.
> Further information is needed to
> for a complete answer, such as:
>
> - Do these nodes need continuous access
> to IPv4 and IPv6 services, or only
> occasional access?
=> I believe continuous access is needed. a PDP
context will be up when the device is turned
on and remain up pretty much the whole time.
Some operators will configure things differently
(e.g. if idle for x hours remove PDP context), but
I believe people want to be "always on and connected"
(not meant to be a mrketing stunt!). This is simply
because once you lose your PDP context you're not
reachable.
> - How many simultaneous IPv4 & IPv6
> connections are expected?
=> Depends on the user, this is orthogonal to the
PDP context(s).
> - What is the planned internal structure
> of the network? Obviously you aren't
> planning to bridge 10 million nodes
> on a single subnet.
=> No.
>
> (2) Neither IPv4 nor NAT-PT will handle a 10 million
> node network as a single address space.
=> NAT-PT can handle them in a single address space. Of course
not in a single box.
> The limitation of 32-bit addressing in IPv4
> is a red herring, since the real limitations
> on the size of a NAT based network is probably
> much lower (a few hundred thousand simultaneous
> connection?).
=> It's a 24-bit address space :)
>
> But, given that you've said this is a 3GPP network, I can
> make some (perhaps flawed) assumptions about how this network
> will be structured:
>
> (1) There will be internal routers (GGSNs) at a
> density of one per ~100,000-500,000 nodes.
=> Correct.
> (2) All nodes will have point-to-point connections
> to a single router (PDP Contexts to the GGSN).
=> correct.
> (3) The nodes will only need occasional access to
> IPv4 & IPv6 services.
=> I think continuous accessibility is required.
We don't want to tear down PDP contexts and start
them again too often.
> (4) IPv4 address configuration (and IPv6 address
> configuration) of the nodes will
> be performed on an as-needed basis
> via the establishment of PDP contexts.
=> No, see above.
I will wait with the replies for the second part
of your email until we agree on the assumptions/scenario
first. I think this is very important and a great start
for detailed scenarios.
Hesham