Reply in line. On Thu, Dec 3, 2009 at 1:20 PM, Sri Gundavelli <[email protected]> wrote:
> Hi Bo, > > > > The discussion slightly digressed. But, its fine and for this >> comment, its >> not really true that host translation will preserve end-to-end >> transparency. >> That is a myth. Any time Hui's PNAT host with its IPv6 transport >> communicates with an IPv4 host on the internet, Hui will move the >> IPv6 >> packet translated from the IPv4 packet to the NAT64 gateway (to be >> precise, >> PNAT64) anyways, and there the IPv6 to IPv4 packet translation will >> be done. >> In fact, per Hui its only header translation on the host and the >> payload >> translation is done on the CGN gateway. So, there goes the >> end-to-end >> transparency and the simplified network argument. >> >> >> >> [Bo] If in 4-6-4 scenario PNAT goes the E2E transparency argument. I >> believe DS-lite will goes the argument as well. DS-Lite need the AFTR has >> the capability of 44 translation, also against the concept of E2E >> transparency. >> >> > Agree. I dont believe DS-lite makes E2E transparency argument. So, we > both agree, host-based translation does not have E2E advantage in > this case. [Bo] I agree "DS-lite makes E2E transparency argument." But left part I do not agree. Host-based translation can make the applications running through the transport network transparency, never care what kind of transport network (IPv4, IPv6) running. Considering of E2E concept, sort out issues at the end is better than in the middle of network. By the way, I think there is a tricky point in DS-lite, DS-lite can assign unlimited IPv4 address to the host, the concept behind this point is very similar as A+P: *save IPv4*, I believe DS-lite is a good solution to save IPv4, but I am not sure it is a good solution for IPv6 migration and deployment. People use DS-lite solution never want to update their service to support IPv6, because no risk of IPv4 address exhaustion exist if DS-lite running well. > >> > Disadvantage: it improve the UE cost explicitly, and others. >> > >> >> >> And exponentially, consider all the OS's and version variants. But, >> on a >> lighter note, there is one more advantage point that you missed, >> employment >> for many folks for years to come for managing the PNAT stack on >> many OS's :) >> >> >> [Bo] If it is true, it is really a good solution not only for the company >> but also for the global economy crisis. >> > > :) > > > Regards > Sri > > -- Regards, Bo Zhou China Mobile
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