Re: [v4v6interim] You have been dugg!

On 7 okt 2008, at 19:26, Fred Baker wrote:

> What does it mean to be "IPv6-like"?

That everything happens mostly automatic and is easy otherwise. For  
instance, in IPv4 you have to think about how big each subnet is. In  
IPv6 you don't.

> The one point of disagreement that I have had with Marcello's  
> Pref64::/96 characterization is that it does something that RFC 4291  
> says to not do. If we have a prefix whose left-most bits are not  
> 000, we are supposed to reserve the right-most 64 bits for host  
> identifier

Yes, I know. What I don't know is why this text was put in the RFC, so  
far nobody has been able (or willing) to tell me that.

> As such, neglecting the question of using the 0::ffff:a.b.c.d,  
> 0::0:a.b.c.d, or 0::ffff:0:a.b.c.d forms, if I have a prefix  
> assigned by the network operator, the address architecture says that  
> I would have to treat all Pref64::a.b.c.d routes as host routes.  
> Tell me that this is not what you're hoping for in an IPv6 address?

Not entirely sure what you're trying to say. But obviously we can  
specify the behavior that we want in a new specification so I don't  
know why it would matter.

> What CERNET has done is define an address that maps to RFC 4291's  
> architecture, allows them to (within that architecture) subnet IPv4- 
> mapped addresses in the IPv6 domain, and use the mapping effectively  
> in routing. If there is anything that I would hope was IPv6-like, it  
> would have those characteristics.

> All you do is crab; you don't like it, but you don't give a  
> technical reason to not like it. What's your point?

The IVI mapping means that at the very least a special subnet has to  
be created for every IPv4-reachable host. The suggestion of having  
non-/64 subnets and DHCPv6 is very problematic because DHCPv6 doesn't  
know about subnet prefix lengths.

The situation where a static mapping is set up means that the  
configuration can be limited to the translation box, this simply makes  
much more sense on every level.
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