On Thu, Jan 14, 2010 at 3:00 PM, Jim Burwell <j...@jsbc.cc> wrote: > On 1/14/2010 11:10, Cameron Byrne wrote: >> Folks, >> >> My question to the community is: assuming a network based IPv6 to IP4 >> translator is in place (like NAT64 / DNS64), are IPv6-only Internet >> services viable as a product today? In particular, would it be >> appropriate for a 3G /smartphone or wireless broadband focused on at >> casual (web and email) Internet users? Keep in mind, these users have >> NAT44 today. >> > You may also want to read up on Dual Stack Lite (DS-Lite) > <http://tools.ietf.org/html/draft-ietf-softwire-dual-stack-lite-02>,
I have looked at DS-lite very carefully. First, DS-Lite fits better for cable operators since they have CPE and can have a DS-lite function in the CPE that they control, and that in turn allows them to provide IPv4, IPv6, and dual-stack to the end-host that they do not control. DS-Lite does not fit as well for a mobile phones since it would require a major change to the phone's OS. Second, DS-Lite requires tunneling as well as translation, so it is one more piece of overhead in addition to NAT64 solution. For me, i believe it is less complex to manage a single stack IPv6 host with NAT64 translation than a dual stack host, tunneling infrastructure, as well as NAT44 CGN, which is what DS-lite requires. They both achieve the same result, but I believe in the mobile space there is a quicker time to market as well as more progress toward the end-goal of IPv6-only using NAT64 than DS-lite. > presuming you haven't. I know you mentioned you didn't like any > dual-stack solutions, but the thing about DS-Lite I like is that it has > no problem with RFC1918 overlap of different customers, since the CGN > uses a tunnel ID in the connection/NAT table in addition to the other > typical data. I just wonder how it will scale, since each device, or a > gateway the device goes though, will require a IPv4-in-IPv6 tunnel to > the CGN box(es). Also, it doesn't require a DNS-ALG like NAT64/DNS64. NAT64/DNS64 does not use a DNS-ALG. DNS-ALG died with NAT-PT. DNS64 is a standalone function which is decoupled from the translation process. >
