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Re: IKE attributes consistency.
>What if the sender elects NOT to include
>the d-h group attribute in one of the transforms?
If there is at least one d-h group attribute in the whole sa
payload (in any transform), then you interpret it to mean that
you ARE using d-h in any case, and that there MUST be a KE
payload in the message.
>On Mon, 18 Dec 2000, Sami Vaarala wrote:
> > Hi,
> > >It was explicitly decided that not including non relevant attributes
> > >NOT
> > >cause rejection of an IPComp proposal. One of the reasons for the
> > >decision
> > >was that _no_ implementation was expecting the non relevant attributes
> > >in an IPComp proposal. Keeping the liberal spirit alive, receivers
> > >quietly ignore irrelevant attributes. The decision was posted to the
> > >ippcp and ipsec lists and later reflected in the rfc2393bis I-D.
> > [...]
> > Why not change the quick mode consistency requirements to the
> > following:
> > 1. the sender SHOULD include a d-h group attribute in every
> > transform.
> > 2. each occurrence of the d-h group attribute MUST have the
> > same value.
> > 3. the receiver MUST accept the sa payload if there are no
> > conflicts in the occurrences of the d-h group attribute,
> > regardless of the number of occurrences of the attribute.
> > Thus it is acceptable to:
> > a) have no d-h group attributes => meaning: no d-h
> > b) have one or more d-h group attributes in any
> > transforms => use d-h group; the same d-h group
> > applies to all proposals. The receiver MUST check
> > that all occurrences have the same value.
> > 4. if there are conflicting d-h group attributes in the proposals
> > (different values) => proposal must be rejected; the receiver
> > MUST check for this condition.
> > This is the most liberal reception guideline I can think of wrt
> > ike qm d-h group.
> > Sami
> > --
> > Sami Vaarala / Pygmy Projects - We make it small!
> > www.iki.fi/~silvere /
> > firstname.lastname@example.org / No matter where you go, there you are.
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