[arin-ppml] Opposed to 2010-9 and 2010-12

Mark Andrews marka at isc.org
Wed Oct 13 08:57:18 EDT 2010

In message <AANLkTimRZxotiHhy7h4rwTcdZCYd1SLmmiRug-UaxhfV at mail.gmail.com>, Will
iam Herrin writes:
> On Tue, Oct 12, 2010 at 11:55 PM, Mark Andrews <marka at isc.org> wrote:
> > There is a increadable amount of bad information being spouted here.
> >
> > If you have a 2 disjoint /16's spead over, multiple pops, then you
> > will have 2 6rd prefixes in use both with a IPv4MaskLen of 16. =A0Only
> > one of these will be handed out to a specific customer. =A0If you are
> > handing out /56's then the 6rdPrefixLen would be 40. =A0Each of these
> > 6rd prefixes would be a /40.
> Hi Mark,
> If you have a dozen IPv4 prefixes or more (as many ISPs do) you're not
> going to maintain a dozen or more 6rd prefixes. Instead, you're going
> to map a full 32 bits into a single 6rd prefix. That's the _practical
> reality_ of an operational network, regardless of what 6rd's designers
> intended. If you don't map 32 bits, you'll at least map your entire
> CGN space in, and that takes a few bits all by itself.

Why not?  It's a one time operation to setup it up when you are
allocated a IPv4 prefix from a RIR/LIR.

> The discussion has been focused on those folks for whom 6rd is not
> useful unless the full 32 bits are mapped. This is not surprising
> since any organization small enough to maintain shorter mappings has
> no trouble fitting 6rd into their original /32 allocation and thus
> doesn't need new policy.

Sorry no one needs to have the full /32 bits encoded into a 6rd
prefix.  No one here has addresses allocated from all 221 /8's that
make up the global unicast IPv4 address space.  Most of you would
have address from at most a handful of /8s.  If you must be lazy
then setup a 6rd per covering /8 from which you have addresses

> Regards,
> Bill Herrin
> --=20
> William D. Herrin ................ herrin at dirtside.com=A0 bill at herrin.us
> 3005 Crane Dr. ...................... Web: <http://bill.herrin.us/>
> Falls Church, VA 22042-3004
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org

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