On Jun 6, 2012, at 5:54 PM, Sheng Hsin Lo wrote:

> Hello, 
> 
> Should the SPD search in IPsec support longest prefix match(LPM)?
> 

Hi

The answer is no. The SPD is an ordered list of entries, and the first match is 
the one to follow. 

RFC 4301 defines a decorrelation algorithm (section 4.4.1 and appendix B) that 
remove overlaps for quicker searches, but that does not change the result fo 
the SPD search, which is first-match.

Hope this helps

Yoav


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