[ppml] ULA

[Scott Leibrand]

Kevin,

All ULA space (L, C, G, or whatever) will come out of a single /7, which 
should be route-filtered on all DFZ routers.  That's the main benefit of 
using ULA-* space rather than PI space for private addressing (and even 
private internetworking): everyone who isn't part of your private 
network can filter your routes with no additional effort, so they don't 
pollute the DFZ if they leak.

-Scott

Kevin Kargel wrote:
>  How will you know their announcement is ULA-C to filter it?  Are you
> saying that you will build a statement for every ULA-C for each ASN in
> the world into your edge access-list?  Or is there some aggregatable
> filter list I am unaware of?  Even if it were as few as 500 filter
> statements, I would not be happy to have to extend an access list that
> far, and I suspect the number of statements required would far outrun
> that humble number.
>
> Feel free to educate me, I want to learn.
>
> Kevin
>
>
>   
>> -----Original Message-----
>> From: ppml-bounces at arin.net [mailto:ppml-bounces at arin.net] On 
>> Behalf Of Iljitsch van Beijnum
>> Sent: Monday, September 17, 2007 10:38 AM
>> To: Paul Vixie
>> Cc: ppml at arin.net
>> Subject: Re: [ppml] IPv6 flawed?
>>
>> On 17-sep-2007, at 17:32, Paul Vixie wrote:
>>
>>     
>>>> Hmmm...Now...what was that long drawn out conversation....that 
>>>> addressed private space in a good way.....oh yeah!  ULA-C!
>>>>         
>>> ULA-C is apparently quite dead, since noone whose job includes 
>>> defending the DFZ from explosion believes that ULA-C would be as 
>>> "local" as ULA.
>>>       
>> Riiiight... that must be why several people told me that PI 
>> is a good alternative for ULA-C, people holding a PI block 
>> will of course never be tempted to announce THAT.
>>
>> I'll be filtering ULA-Cs that people announce, or they'll be 
>> giving me enough money that I'm happy to accept the 
>> advertisements. No problem either way.
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