Hi John and Margaret, Late reply, but I have been traveling quite a lot lately...
You are right, RAs will of course be per PDP context. What I had in mind (though it's not what I wrote in my hasty reply) is that all terminals attached to a given APN would receive RAs with the same upper 48 bits. But it was without considering that we could allocate a x/ IPv4 address to an APN, with x<32, as suggested by Brian, and thus raise the limit to 2^(32-x) times 64k PDP contexts per APN when using 6to4 (though one could wonder whether this is totally in line with RFC 3056). So I guess I agree that the limit is not strictly 64k PDP contexts per APN. BR, Juan Hughes John-CJH023 wrote: > > Hi Margaret, > > I agree with you that the router advertisement will be different for each PDP >context, after all the RA is the mechanism by which the MS is notified of the prefix >which it may use and if /64 is being assigned on a per PDP context basis then each >prefix must be different. > > However for each IPv4 address, there can only be 64k (well 2^16) prefixes where 6to4 >is being used. So it is still the case that with 6to4, each IPv4 global address >allows 64k PDP contexts per APN to be supported. Having n IPv4 addresses, will allow >n x 64k PDP contexts to be supported per APN. > > I echo a comment by Brian, 6to4 is intended to be a transition mechanism and is not >intended for sites with >30 or 40 million users. When IPv6 in 3GPP is that successful >where an operator has >30 million IPv6 PDP Contexts, there should exist native IPv6 >connections. > > I do not see your draft preventing the use of 6to4, so long as an operator does not >plan using 6to4 as a long term strategy. > > Regards, > John > > > >Well, all terminals attached to a given APN will receive the > > same router > > >advertisements from the GGSN, so having two IPv4 global addresses per > > >APN would simply mean that each primary PDP context would > > get two 6to4 > > >addresses, but the limit will still be 64k primary PDP > > contexts per APN. > > > > Why would all terminals attached to a given APN receive the > > same router > > advertisements? Won't there be multiple PDP contexts associated with > > a given APN? If so, the GGSN should be sending different router > > advertisements for each PDP context, each containing the prefix(es) > > assigned to that particular PDP context. > > > > Since each prefix will be assigned to one (and only one) PDP > > context, I > > think that you will have the possibility of assigning 64K > > 6to4 addresses > > per PDP context, not per APN. > > > > Am I misunderstanding something? > > > > Margaret > > > > > > -------------------------------------------------------------------- > > IETF IPng Working Group Mailing List > > IPng Home Page: http://playground.sun.com/ipng > > FTP archive: ftp://playground.sun.com/pub/ipng > > Direct all administrative requests to [EMAIL PROTECTED] > > -------------------------------------------------------------------- > > -- ---------------------------------------------- Juan-Antonio Ibanez Ericsson Mobile Data Design AB Gothenborg - Sweden Tel.: +46 31 344 1828 (mobile) Email: [EMAIL PROTECTED] ---------------------------------------------- -------------------------------------------------------------------- IETF IPng Working Group Mailing List IPng Home Page: http://playground.sun.com/ipng FTP archive: ftp://playground.sun.com/pub/ipng Direct all administrative requests to [EMAIL PROTECTED] --------------------------------------------------------------------
