[arin-ppml] ARIN Draft Policy 2011-5: Shared Transition Space

[Owen DeLong]

On Jul 5, 2011, at 2:01 PM, William Herrin wrote:

> On Tue, Jul 5, 2011 at 3:57 PM, Chris Grundemann <cgrundemann at gmail.com> wrote:
>> In response to the IAB statement regarding ARIN-2011-5, several of us
>> have compiled an Internet Draft analyzing the need for shared
>> transition space. You can find it online here:
>> http://tools.ietf.org/html/draft-bdgks-arin-shared-transition-space.
> 
> Thanks Chris, and everybody else who worked on this!
> 
> Some comments:
> 
> 1. In 2.1.3, SP services is not a good use case. Quasi-multihoming
> with a NAT box switching traffic between two separately numbered
> Internet connections is becoming increasingly common. With a /10,
> there's a very small chance of collision between the address assigned
> on each connection, but with services hosted on that /10 that the
> customer wants to reach, the chance of mayhem rises sharply.
> 
> 2. Router interface numbering is a potential use case. Filtering of
> RFC1918 is too widespread to overcome, so using it outside the NAT
> breaks path MTU detection. That's not inherently true of this new
> space and nonfiltering could be encouraged in a way that renders it
> usable in a few years.
> 

Not really... How would you know which ISP to route the packet
back to?
> 

Owen