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Re: IPComp rfc2393bis-00
>>>> 0-63 define well-known compression algorithms, which require no
>>>> additional information, and are used for manual setup. The
>There is a second use - to save the CPU cycles of the
>CPI-to-algorithm conversion, even when the algorithm is negotiated
>dynamically. That is the rationale for the note in the CPI definition:
> Compression Parameter Index (CPI)
>
> 16-bit index. The CPI is stored in network order. The values
> 0-63 define well-known compression algorithms, which require no
> additional information, and are used for manual setup. [...] Note: When
> negotiating one of the well-known algorithms, the nodes MAY
> select a CPI in the pre-defined range 0-63.
BTW If you use this optimization, the negotiated IPComp association
will never get expired if it uses bytecount as expiration signal.
itojun
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