[ppml] Policy Proposal: IPv6 Assignment Guidelines

Ted Mittelstaedt tedm at ipinc.net
Wed Aug 22 22:43:34 EDT 2007

>-----Original Message-----
>From: ppml-bounces at arin.net [mailto:ppml-bounces at arin.net]On Behalf Of
>Scott Leibrand
>Sent: Wednesday, August 22, 2007 4:51 PM
>To: Iljitsch van Beijnum
>Cc: ppml at arin.net
>Subject: Re: [ppml] Policy Proposal: IPv6 Assignment Guidelines
>Iljitsch van Beijnum wrote:
>> On 23-aug-2007, at 1:31, Scott Leibrand wrote:
>>> I've heard this argument (in favor of /60 instead of /56) before, and 
>>> either would be fine with me, but I still don't understand why 
>>> renumbering from a PA /56 into a PA /48 would be any harder than 
>>> renumbering from a PA /48 to another provider's PA /48.
>> The choice isn't the one between renumbering from a /56 to a /48 vs a 
>> /48 to a /48, but from a /60 to a /48 vs a /56 to a /48. I think /60 
>> -> /48 is a lot less painful. Once you move from a /60 to a /48 (or 
>> skip the /60 because you know you're not a residential user in the 
>> first place) you won't have to renumber when you deploy more subnets; 
>> only when changing ISPs.
>Ok.  I'm assuming that networks would renumber due to change ISPs a lot 
>more often than they would need to renumber due to network growth.  I 
>would also anticipate that any network growing larger than a /56 would 
>qualify for an IPv6 PI /48, and would therefore only need to renumber 
>once.  I don't think the same could be said of all networks growing 
>beyond a /60.

I think your both naieve to think that your typical corporate customer
with a couple hundred nodes and no redundancy to the Internet is going
to put up with being told he has to renumber his entire internal network
when he decides his current ISP is a chuckhead and decides to go to a
competitor.  I think said customer is going to look at the money that the
labor hours would consume to do this, then call up Cisco and offer them
1/4 of that, and Cisco will happily take the money and supply a 
double-translation NAT box that will nat IPv6.  They already have such
things for IPv4 that allow people to do things like run their internal
IPv4 network on the same numbers that are used for the root nameservers,


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