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Re: mech-v2-05pre


Wouldn't the version check be part of the standard IPv6 processing?
Why do we want to mandate it here as well?

I can see the need to make sure that we have enough data, so the
decapsulator may want to check that it has at least 40 bytes of
payload, but the version check seems redundant to me.

-vlad


Pekka Savola wrote: 
On Wed, 25 Aug 2004, Fred Templin wrote:

In section 3.6, change:

"If the payload is not at least 40 bytes in length (i.e., the minimum
IPv6 packet), the packet MUST be discarded. Likewise, if the the
version encoded in the first 4 bits of the encapsulated packet is not
"6", the packet MUST be discarded.
The encapsulating IPv4 header is discarded."

to:

 "The encapsulating IPv4 header is discarded, and the version
  encoded in the first 4 bits of encapsulated packet is checked.
  If the version is "6" and the payload is not at least 40 bytes in
  length (i.e., the minimum IPv6 packet), the packet is discarded.
  (Procedures for handling packets with version other than "6" are
  out of scope.)"

If anyone is unsure why this is being suggested, please see the
IPvLX draft before commenting here.



I think this proposed change would only add ambiguity.  It seems
clearer to specify these before specifying discarding the v4 header.


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Vladislav Yasevich		Linux and Open Source Lab
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