IPv6 /64 links (was Re: ipv6 book recommendations?)

Tue Jun 19 23:34:11 UTC 2012

Karl Auer wrote:

>>          host <-> home UPnP NAT <-> Carrier UPnP NAT <-> Internet
>>          <-> Carrier UPnP NAT <-> home UPnP NAT <-> host
> 
> "Trivially"?  I think this looks much nicer:
> 
>            host  <->  Internet  <->  host

Yes, if only the Internet were uniform.

However, compared to

                   V6 incapable                 V6 capable
           host  <-> Internet<-> home router <-> Internet  <->

        6/4 tunnel   V6 capable   6/4 tunnel    V6 capable
        end point <-> Internet <-> end point <-> Internet <->

                      V6 incapable
        home router <-> Internet <-> host

which can often be:

                   V6 incapable                 V6 capable
           host  <-> Internet<-> home router <-> Internet  <->

        6/4 tunnel V6 *INCAPABLE* 6/4 tunnel    V6 capable
        end point <-> Internet <-> end point <-> Internet <->

                      V6 incapable
        home router <-> Internet <-> host

>>          host <-> home UPnP NAT <-> Carrier UPnP NAT <-> Internet
>>          <-> Carrier UPnP NAT <-> home UPnP NAT <-> host

is just trivial and uniform.

> The way it used to be before NAT, and the way, with IPv6, it can be
> again.

With IPv6, see above.

						Masataka Ohta