Re: Allocations for "always-on" ISPs
- Date: Thu, 07 Dec 2000 12:16:20 +0100
Dear Bruno,
Bruno Ciscato bruno@localhost writes:
* Hi!
* With the advent of technologies like ADSL and Ethernet to the
home, several
* new ISP in Europe are starting to offer "always on" Internet
access.
* The allocation strategies vary, if they give a subnet to each
household this
* is usually a /29, if they group more than one household in each
subnet the
* average IPv4 address consumption by each household can be a little
less.
* In any case they need a lot of addresses, i.e. a few millions.
* Can someone help me to see if what I think it would happen is
correct?
* 1) they request address space to RIPE, with a nicely written
documentation t
* hat clearly shows that they need millions of addresses
* 2) nonetheless they won't receive more than a /20 to begin with
It is correct that all LIRs receive a /20 as a *first* Allocation.
This is to ensure a fair distribution of address space.
* 3) when they have used more than 80% of this /20, and can prove
it, another
* one will be assigned, most likely not contiguous
This is not entirely correct.
Yes, the LIR does need to show 80% utilisation. Depending on how
quickly the LIR comes back, the LIR might be able to get a contiguous
block of addresses. If the first allocation is used up very quickly,
the higher the chances that the next allocation is contiguous.
The future allocations are not necessarily a /20 however. Based on
the utilisation rate of the initial /20 Allocation, the LIR will
receive an allocation, presumably large enough to cover the need in
the following two years. In other words: the first allocation is a
/20, the future allocation is based on the utilisation rate.
If the second allocation is larger than a /20 and there is a /20
contiguous to first allocation available, the LIR is asked whether
they want the contiguous /20 plus another separate range to cover the
full needs, or if they prefer getting the entire second (larger)
allocation from a separate address range.
Hope this made things clearer.
Cheers,
--
Nurani Nimpuno
Registration Services Manager
RIPE NCC
As Bhabuta pointed out, this depends
* 4) and so on and so forth, at a very fast pace, until they will
have a very
* fragmented address space
* Is this correct ?
* Is it safe to assume that if they start using public address,
where really n
* eeded, they will always receive new allocations if they can prove
they need
* it until IPv4 addresses last ?
* Is there any way to reduce the address space fragmentation due to
new non co
* ntiguous allocations ?
*
* Thanks
*
* bruno
*
*
*
