Hi Satoru, Set EA bits=0 only saves bits in v6 address and decouples v4/v6 address dependency. It doesn't bring any new function compared to embedding full v4 address in the EA-bit. However, the operation models of EA-bit>0 or =0 are very different. By the way, this works only for MAP-E. I fail to see why we want to include this in the base spec.
Thanks, Yiu On 7/25/12 9:45 PM, "Satoru Matsushima" <satoru.matsush...@gmail.com> wrote: >Hi Yiu, > >On 2012/07/26, at 4:08, Lee, Yiu wrote: > >> Ole, >> >> Where can I get the formal definition of 1:1 mode? My understanding of >>1:1 >> refers to one public IPv4 address per subscriber but you refer very >> specific to decoupling IPv4 and IPv6 addresses. >> > >It doesn't 1:1 in MAP and 4rd context, because embedding full ipv4 >address in ea-bits is as a result of prefix allocation operation. > >> Before MAP was accepted as WG item, MAP was proposed to embed IPv4 >>address >> information (EA bits > 0) in the CE IPv6 address to achieve stateless. > >No, there was no such definition for EA-bits length restriction. > >> Now there is a new proposal to add a new feature to have the IPv4 >>information >> in the BR only. This change requires to provision individual subscriber >> information to the BR (instead of aggregated information). Benefit are >> saving bits and breaking v4 and v6 address dependency. > >There's no change from previous spec, to just clarify MAP, as a stateless >solution, could naturally support most granular mapping rule in its >nature. > >> >> Questions to WG: >> Is it useful feature to be included in MAP? If not, why and alternative? >> > >I believe that it does not make sense to restrict EA-len > 0 for both MAP >and 4rd. It does make sense that you see MAP as framework of solutions >which covers specific 1:1 solution by the mapping algorithm. > >cheers, >--satoru > > >> Thanks, >> Yiu >> >> On 7/25/12 2:40 PM, "Ole Trøan" <otr...@employees.org> wrote: >> >>> Yiu, >>> >>>> I am not asking whether MAP supports 1:1 mode with no EA bits or not. >>>>I >>>> am >>>> asking MAP allows to embed the 32-bit address in the EA bits to >>>>achieve >>>> 1:1 mode: >>>> >>>> "The EA bits can contain a full or part >>>> of an IPv4 prefix or address, and in the shared IPv4 address case >>>> contains a Port-Set Identifier (PSID)." >>>> >>>> Why not use this instead? >>> >>> you can do either. >>> embedding a complete IPv4 address and PSID does require a lot of IPv6 >>> space though. >>> e.g. /56 - 32 - 6 = /18 >>> >>> 1:1 mode is typically referred to a model where IPv4 and IPv6 >>>addressing >>> are independent. >>> >>> cheers, >>> Ole >>> >> _______________________________________________ >> Softwires mailing list >> Softwires@ietf.org >> https://www.ietf.org/mailman/listinfo/softwires >
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