rfc2460bis and Frag ID generation

[Fernando Gont <[e-mail]>]

Bob/folks,

The current text regarding frag ID generation in rfc2460bis says:

---- cut here ----
      *  "recently" means within the maximum likely lifetime of a
         packet, including transit time from source to destination and
         time spent awaiting reassembly with other fragments of the same
         packet.  However, it is not required that a source node know
         the maximum packet lifetime.  Rather, it is assumed that the
         requirement can be met by maintaining the Identification value
         as a simple, 32-bit, "wrap-around" counter, incremented each
         time a packet must be fragmented.  It is an implementation
         choice whether to maintain a single counter for the node or
         multiple counters, e.g., one for each of the node's possible
         source addresses, or one for each active (source address,
         destination address) combination.
---- cut here ----


I suggest changing the text to:

---- cut here ----
      *  "recently" means within the maximum likely lifetime of a
         packet, including transit time from source to destination and
         time spent awaiting reassembly with other fragments of the same
         packet.  However, it is not required that a source node know
         the maximum packet lifetime.  Rather, it is assumed that the
         requirement can be met by implementing an algorithm that
         results in a low identification reuse frequency. [RFC7739]
         discusses possible algorithms that can meet this requirement
         while avoiding possible security and privacy issues.
---- cut here ----

(where the ref to RFC7739 is obviously informative, rather than normative).

 -- Bottom-line is that rfc2460bis shouldn't suggest algorithms that
have known issues, and it's better to have an informative reference to
RFC7739, where possible algorithms are discussed.

Thoughts?

Thanks!

Best regards,
-- 
Fernando Gont
SI6 Networks
e-mail: [e-mail]
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