[ppml] And as for assignments...

Jonathan Barker jonathan at qx.net
Sun Aug 26 11:45:08 EDT 2007

michael.dillon at bt.com wrote:
> This is by design. The IPv6 designers created an architecture in which
> home users, businesses and other organizations were all given far more
> addresses than they would NEED. This allows the network to grow by
> adding layers of heirarchy at any point. In-law suites, neighborhood
> wireless, gaming party subnets, etc.

It's poor design then. As Iljitsch astutely observed, IPv6 was designed 
years ago, before DHCP came into widespread use. Stateless 
Autoconfiguration, While a nice thought - can be simply DHCP from the 
router you have to use at your home to terminate V6.  Sparse host -  You 
know - for years people have launched bots to scan the network for open 
hosts to infect. Now - they have infinitely more space to scan, and have 
to transmit more and larger packets to do it. With ever increasing 
processor power... Bot scanning and the massive number of packets now 
needed to scan for hosts could become a real problem. I think firewalls 
on those home routers are a better idea. Privacy Addresses - The US 
Government has a nice little law called the Communications Assistance 
for Law Enforcement Act. CALEA. I have to be able to wiretap my 
customers. It's the law. The privacy addresses will just make it a 
little more difficult to isolate what's what for big brother.

>> I know with my current DirecTV, XBOX, 
>> PS3, Vista Media Centers at home all participating on my 
>> network, they do not like being in separate subnets. 
> Strange. Internet access always crosses a subnet boundary going through
> one or more routers. IP does this by design.
Broadcast traffic that allows Media Extenders to auto discover one 
another does not cross subnets. (no one would want it to.) Get an XBOX, 
PS3, Vista Media Center, and something from Sky and try it yourself. 
This is an example of Real World vs. Theory. It doesn't matter if you 
can connect to an XBOX media extender across continents using some 
customized programs / settings. If it's not easy, 99.9% of real people 
will be unable to use the feature. So - keep your XBOX in the same 
subnet as your Media Center.
> Of course you are not the only person. There are lots of people who
> learned about networking with IPv4 as the main protocol and IPv6 as a
> footnote. Most of these people will listen to advice and buy a book or
> two on IPv6 to learn how it is different from IPv4.
A book that will be outdated in 3 years.
>> My question is - What is wrong with my logic, in that most 
>> people who are commenting don't think in these terms?
> 1) You don't understand how IPv6 works.
> 2) Your suggestions amount to a redesign of IPv6 which may be
> appropriate discussion material on an IETF mailing list, but not here on
> ARIN lists.
1) I understand how it *should* work with what technology we have today.

2) Ideas regarding the assignment and allocation of IP space - 
particularly when it pertains to providers needing 2nd or 3rd IPv6 
allocations - simply due to wasteful subnet requirements - are perfectly 
suited to the ARIN mailing list.


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