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<p>(SPI) of <code>A</code> and <b>HostB</b> has an <a href="page.php?w=Security_Parameter_Index">SPI</a> of <code>B</code>, the scenario would look like this:</p>

<p><pre>HostA -------------------------------------------------- HostB     |HDR(A,0),sai1,kei,Ni-------------------------->   |     |   <----------------------------HDR(A,0),N(cookie)|     |HDR(A,0),N(cookie),sai1,kei,Ni---------------->   |     |   <--------------------------HDR(A,B),SAr1,ker,Nr|</pre></--------------------------hdr(a,b),sar1,ker,nr|</pre></----------------------------hdr(a,0),n(cookie)|></pre></p>

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