On Thu, 30 Aug 2007 08:27:23 -0700 Scott Leibrand <[EMAIL PROTECTED]> wrote:
> Jun-ichiro itojun Hagino wrote: > >> I'm inclined to believe that dual-stack provider networks are going to > >> be relatively rare, and may not exist at all. I think it'll either be > >> > > > > WIDE and two of the biggest japanese ISPs are already dual-stacked, > > and if my guess is right it has been so for more than 5 years. > > it is not economical to purchase separate trans-pafici circuit. > > Oh ok. Down here in .au our perspective on things like IPv6 deployment tends to get warped by being an English speaking country. I know Japan has IPv6 quite widely deployed, however we rarely if ever see any English news about it. > > Itojun, > > I believe he was referring to the *method* of supporting both IPv4 and > IPv6, and arguing that core routers will tend to be addressed with > either IPv4 or IPv6, but not both. Instead, support for the second > protocol will tend to be provided by edge routers tunneling across the > core (using 6PE, softwires, or another method), rather than by native IP > forwarding by core routers. These solutions don't require separate > circuits for IPv6 and IPv4 traffic. > That's what I was trying to say. It seems to me that the relative simplicity of a single core forwarding protocol and more general purpose characteristics (of MPLS, GRE or L2TP) of these "edge-to-edge tunnelling methods" might to be more appealing than dual-stack for those who haven't already deployed dual-stack, in particular if they're facing a hardware or software upgrade cycle to get there. > Are you familiar enough with the internal addressing of those Japanese > ISPs to say whether they address their core routers with both IPv6 and IPv4? > > Another consideration is how big a given network's "core" is. In the > case of a geographically constrained network, it may be quite small, and > a dual-stack core may make more sense than MPLS. For large global > networks, however, it appears to me that tunneling across the core is > becoming the preferred mode of operation. > > > -Scott Regards, Mark. -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www1.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
