IPv6 filtering (was Re: IPv6 internet broken, cogent/telia/hurricane not peering)

[marcoh at marcoh.net (Marco Hogewoning)]

On Oct 12, 2009, at 9:14 PM, Jack Bates wrote:

> Dan White wrote:
>> Reputation lists will just be on the /64, /56 and /48 boundaries,  
>> rather
>> than IPv4 /32.
>
> And then people will scream because someone setup a layout that  
> hands out /128 addresses within a /64 pool.


There is that chance yes especially from access networks which use RA.

As this thread has drifted off topic any way, would it for instance be  
a good idea to simply not accept mail from hosts that clearly use  
autoconfig ie reject all smtp from EUI-64 addresses. Of course not a  
wise idea for your own outbound relays which should handle mail from  
your customers but on the incoming side it might as well save a lot of  
headache and there is no need to keep track of which /64 are access  
networks.

Just a few cents,

MarcoH