who gets a /32 [Re: IPV6 renumbering painless?]

Sun Nov 21 02:52:03 UTC 2004

Alex,

I am aware of how telcos work in general, and, in some detail in the united
States.  I also agree with most of what you said.  However, consider
that somehow, they have scaled this to many many more customers than
the total number of internet subscribers.  There must be something for
us to learn there, even if we are missing what it is right now.

Owen

--On Saturday, November 20, 2004 13:18 +0000 Alex Bligh <alex at alex.org.uk> 
wrote:

>
>
> --On 19 November 2004 09:40 -0800 Owen DeLong <owen at delong.com> wrote:
>
>> If it were true, then I would have to renumber
>> every time I changed telephone companies.  I don't, so, obviously, there
>> is some solution to this problem.
>
> But I'm not sure you'd like it applied to the internet. Firstly, in
> essence, PSTN uses static routes for interprovider routing (not quite
> true,
> but nearly - if you add a new prefix everyone else has to build it into
> their table on all switches). Secondly, IIRC porting works in the UK
> something like - call delivered to switch of operator who owns the block,
> marked as ported number, lookup in central porting database (one for all
> operators), operator port prefix put on dialed number, call sent back out
> all the way to interconnect, enters new operator network, goes to switch
> managing ports, further signalling info added to make call go to the
> correct local switch, call goes to correct local switch, dross removed,
> call terminated.
>
> Roughly speaking this is the internet equivalent of:
> * Configure all interprovider routes by a static routing config loaded
>   every week or so.
> * Handle porting by getting ICANN to run a box with a primative gated
>   BGP feed connected to all your distribution routers. Where a packet
>   is delivered to a distribution router and the IP address has changed
>   providers, change the next hop received from the ICANN BGP feed
>   to a GRE tunnel to the appropriate provider's tunnel termination box.
> * At that tunnel termination box, static route all ported-in IP addresses
>   to the correct distribution router.
>
> Yum yum.
>
> Sometimes we don't have lessons to learn from the PSTN world, and instead
> the reverse is true.
>
> Alex

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