[arin-ppml] Policy Proposal 113: IPv6 for 6rd

[Michael Richardson]

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I don't understand why an ISP that has only a /20 of IPv4 needs a /32 of
IPv6 to do 6rd.  A /20 of IPv4 has 12 bits of "host", so
it needs 64-12= /52 to perform the mapping.  That easily fits into a /48!!

We can even be more generous and afford to give the ISP enough to give
the end user a /56 or /60 once we realize that there are dozens of
redundant bits.

NOTE: this requires seperate IPv6 subnet block for each IPv4 allocation,
      but that's okay, it can all easily fit into a single allocation
      for an ISP.

If 6rd implementations are stuck at /32, then it really early enough to
fix this.  I've looked at the Linux 6rd sit code, and turning into a
and/or mask + shift would be rather easy.
(No CPE needs to be changed, because that's all statically configured
 tunnels + default route)

- -- 
]       He who is tired of Weird Al is tired of life!           |  firewalls  [
]   Michael Richardson, Sandelman Software Works, Ottawa, ON    |net architect[
] mcr at sandelman.ottawa.on.ca http://www.sandelman.ottawa.on.ca/ |device driver[
   Kyoto Plus: watch the video <http://www.youtube.com/watch?v=kzx1ycLXQSE>
	               then sign the petition. 
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