[arin-ppml] IPv4 SWIP requirements (?)

[Kevin Blumberg]

David,

My understanding of best practices was /56 for residential and /48 for business. 

My hesitation with requiring all static /48's to be SWIP'ed is that it will push companies to /56.

The paradigm with IPv6 is very different, which complicates the discussion. A single business user with 1 computer could get a /48 or a company with 5000 computers. 

Another way around the issue is to require SWIP when a /48 or larger block is routed. If the block is not part of the routing table I don't see how a simple assignment is going to help anyone.

Thanks,

Kevin Blumberg

-----Original Message-----
From: ARIN-PPML [mailto:arin-ppml-bounces at arin.net] On Behalf Of David R Huberman
Sent: Monday, June 19, 2017 1:37 PM
To: arin-ppml at arin.net
Subject: Re: [arin-ppml] IPv4 SWIP requirements (?)

Hello,

Albert wrote:

> Based on comments so far, most agree that a /48 should be SWIP'ed 
> since it is routable on the internet, and since so far the majority 
> seems to think that /56 is small enough to not require SWIP, this 
> leaves 7 choices of /49 to /55 to set the limit for SWIP in the Draft.

I think that when we consider SWIP boundaries, we should take into account strictly technical considerations, and not arbitrary ones.  I think the argument for requiring a /48 or larger to be SWIPed is well-grounded in network engineering practices.  I'm not sure I understand the technical argument for anything smaller than a /48 being mandatory.

Thank you,
David
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