ARIN IP6 policy for those with legacy IP4 Space

John Palmer (NANOG Acct) nanog2 at
Wed Apr 7 17:54:44 CDT 2010

I kind of thought that was something that had already been worked out.

Thats what I get for not paying close enough attention.

----- Original Message ----- 
From: "Deepak Jain" <deepak at>
To: "Lee Howard" <lee at>; "'Gary E. Miller'" <gem at>; "'OwenDeLong'" <owen at>
Cc: "'NANOG list'" <nanog at>
Sent: Wednesday, April 07, 2010 5:31 PM
Subject: RE: ARIN IP6 policy for those with legacy IP4 Space

Now I may be talking crazy...

IIRC, all of IPv4 space maps to a section of IPv6 space.

<mad hat on>

If one has legacy IPv4 space, but actually talks IPv6 couldn't one announce a prefix much longer than a /64 to map them onto the 
IPv6 universe (assuming people would allow such craziness... perhaps on their IPv4 speaking routers) and originate/terminate traffic 
as normal?

</mad hat off>

Isn't this all left to the networks to enforce, as usual, but unlike the status quo, these are all valid allocations...

Technical note: I know this breaks lots of IPv6 goodness (no need to enumerate it here).


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