how SA changes

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hi<BR>
i have a two freeswan gate way for two different subnet and it is working f=
ine<BR>
Now I wants to know after renegotiation of SA how freeswan changes its stat=
e from old SA to new SA.<BR>
Means how one gateway inform to other gateway, that after this time he will=
 use new SA.<BR>
If packet processing depends on SPI how much time IPSec should retain the o=
ld SA.<BR>
thans in advance<BR>
ravi<BR>

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hi
i have a two freeswan gate way for two different subnet and it is working f=
ine
Now I wants to know after renegotiation of SA how freeswan changes its stat=
e from old SA to new SA.
Means how one gateway inform to other gateway, that after this time he will=
 use new SA.
If packet processing depends on SPI how much time IPSec should retain the o=
ld SA.
thans in advance
ravi

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