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Re: [Softwires] Unified Softwire CPE: draft-bfmk-softwire-unified-cpe

Ole Trøan <otroan@employees.org> Sat, 01 December 2012 12:11 UTC

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From: Ole Trøan <otroan@employees.org>
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Date: Sat, 01 Dec 2012 13:11:16 +0100
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References: <94C682931C08B048B7A8645303FDC9F36E98AB16AD@PUEXCB1B.nanterre.francetelecom.fr> <50B8ADAD.5010409@viagenie.ca> <94C682931C08B048B7A8645303FDC9F36E99E2D6F6@PUEXCB1B.nanterre.francetelecom.fr> <9207CAAE-7907-4103-994C-07961030FAE9@employees.org> <CAH3bfACEZC9tYfpyOXu8sCWAvD9uFou1tLAxESvwPavKV4HESw@mail.gmail.com> <9D4F2E9C-FA92-48D6-AF14-69BC86F3D4B9@employees.org> <CAH3bfABSRon0NWGJv7H_mgocTX-VwroKcqEr5mYyrp2BXcV5MA@mail.gmail.com>
To: Qiong <bingxuere@gmail.com>
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Subject: Re: [Softwires] Unified Softwire CPE: draft-bfmk-softwire-unified-cpe
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Qiong,

[...]

> MAP could also create its tunnel endpoint address from the WAN prefix (not address).
> so you'd have, for CPE tunnel end point address:
> Thanks for clarification. But if MAP uses the WAN prefix as its tunnel endpoint address, does BR need to keep all the records for CPEs (because the CPE's WAN prefix might be arbitary) ? Or do you mean the CPE's WAN prefix will be embedded with EA bits ? Would you please explain it a bit more ?  

from MAP's perspective it doesn't matter if it is a /64 on the WAN or a /56 delegated prefix.
any prefix can have EA bits.

> 1) arbitrary IPv6 address (DS-lite)
> Why it is arbitary ? Is it the source address of the tunnel endpoint ?

in DS-lite the tunnel concentrator learns the tunnel endpoint address when the NAT bindings are created.
so the CPE is free to pick whatever IPv6 address it has. this is different from Public 4over6 and LW46 where the
address has to be configured on both ends.

cheers,
Ole

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