Hi,Neale , Radu and Fan 
      Now the ipsec in VPP did not record the traffic timestamp in sa and  spd 
like linux kernel . So we can not Implement the full DPD  function In IKE 
control daemon that only send DPD when no traffic .
What is the good method to add timestamp .  This method should be fit to both 
sync node and async mode. 
Use a new timestamp  counter or add timestamp in old couter ipsec_sa_counters ? 

     struct xfrm_lifetime_cur {
__u64 bytes;
__u64 packets;
__u64 add_time;
__u64 use_time;
};


Thanks 
    Guangming


zhangguangm...@baicells.com
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