<div>hi all,</div>
<div> Is there a way to sync the SN in the outbound SA with the peer?</div>
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<div> Currently I want to make a 1 + 1 backup with my security gateway. In another word, I have two server and I want to the backup server can manager ipsec tunnels immediately when the working server crashes. I can backup everything including SAs, SPs and IKE info. But SN in the SA cannot be backup because the server will send about 2 million esp packets per second. That leads to an issue because the backup sender must send the esp packet with the proper SN. Otherwise the receiver will discard the packet.</div>
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<div> So I want to know weather there is a way to know the SN in the outbound SA? Is there a IKE information message carrying such payload? Or is it a way to back up the SN very conveniently?</div>
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<div>Best regards,</div>
<div>nanjian5</div>