> On 1/3/09, Alex Balashov <abalashov@evaristesys.com> wrote:
> > That would depend on where the number went "back" to.
> >
> > Underlying carrier? Pooling? Another level of ITSP resale?
> >
> > Number block ownership and routing is assigned. Carriers can't just
> > pick a number and start providing it. Kind of like IP addresses and BGP.
> >
>
> I don't know if I would make the comparison to IP and BGP...
>
> It's widely known (and demonstrated) that very, very few (if any)
> upstreams filter and/or verify route advertisements. It's really a
> mess.
>
> Spammers advertised "unused" blocks they find and spam from them.
>
> Pakistani Telecom jacks YouTube somewhat-globally with a more
> specific advertisement of YouTube's IP space.
>
> Pilosov/Kapela attack, etc.
>
> Totally off topic but I though I'd at least bring it up.
>
on a side note I discovered that some telephone carriers were using
unassigned blocks and they were routable for a while in iowa. So
stranger things have happened in the telecom world. According to NANPA
these blocks were never issued to anyone, ever. Google also returns
several hundred businesses advertising numbers in this block (like
garages, markets, and others not online or shady things).
--
Trixter http://www.0xdecafbad.com Bret McDanel
pgp key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x8AE5C721
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