Hi All,


One comment/request on the IKEv2bis draft.



One of the differences between RFC 4306 and the IKEv2bis draft is in Section
2.17, Generating Key Material for Child SAs.  Appendix E.2 of the IKEv2bis
draft indicates the following:



   In Section 2.17, removed "If multiple IPsec protocols are negotiated,

   keying material is taken in the order in which the protocol headers

   will appear in the encapsulated packet" because multiple IPsec

   protocols cannot be negotiated at one time.



Is it possible to leave the quoted text in the spec?  I agree that multiple
IPsec protocols cannot be negotiated at one time; however, the text is
useful for ROHCoIPsec implementers, where multiple keys may need to be
generated for a ROHC-enabled Child SA.



For example, if a ROHC-enabled Child-SA with ROHC_INTEG
[draft-ietf-rohc-ikev2-extensions-hcoipsec-09] is instantiated, first the
IPsec encryption/authentication keying material will be taken, then an
additional key will be taken for the algorithm used to verify the proper
decompression of packet headers.



BR,

Emre
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