[Softwires] New version of 4rd-U - with plain Encapsulation as a variant

Rémi Després <despres.remi@laposte.net> Sat, 28 January 2012 17:59 UTC

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Date: Sat, 28 Jan 2012 18:59:35 +0100
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Subject: [Softwires] New version of 4rd-U - with plain Encapsulation as a variant
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Hello all,

The new version of the proposed unified 4rd has just ben posted.
It is available at:
  http://tools.ietf.org/html/draft-despres-softwire-4rd-u-03

A major evolution since the previous version has been to have in it two variants.
- The Header-mapping variant is as in the previous version
- The Encapsulation variant is added after comments received, and accepted, that some use cases cannot be satisfied if the Header-mapping variant is the only one. 

Compared to the alternative approach of several MAP documents, the single-document approach is expected to avoid duplicate specifications, and to facilitate consistency checks of the design.
Besides:
- Header-mapping provides more complete transparency to IPv4 packets than solutions using twice the IPv6/IPv4 translation of RFC6145.
- It has also the advantage of a simpler and self-sufficient specification.
- The algorithm which permits BRs to forward datagram fragments without datagram reassembly is included.
- The problem of fragmented datagrams from shared address CEs that must have different Identification if they go to common destinations is covered.
- The design re-introduces the Domain IPv6 suffix which in some earlier 4rd designs, and somehow has been lost. 
- The port-set algorithm is without parameter.

All questions and comments will be most welcome.

Regards,
RD