We are detecting problems with a VPN Tunnel using IKEv2. The tunnel is a L2L tunnel agains a third party vendor (Sonic Wall) the tunnel works fine on all the aspects, but sometimes the tunnel falls down and we do not why exactly. When the tunnel falls it takes onlpy a few seconds to up the tunnel again.
The error that I saw on the logs when the tunnel fall is the following:
-Description: IKEv2 IKE SA is down determined by DPD
It results that DPD no exists on IKEv2 and as substituction, liveness check appear, so I don't know what this error exactly is.
Can you help me?
As per logs it seems you have DPD on.
Does other side also had DPD on?
When PA sees other side Phase 1 is down then you logs showing tunnel is down.
DPD Periodically, it will send a “ISAKMP R-U-THERE” packet to the peer, which will respond back with an “ISAKMP R-U-THERE-ACK” acknowledgement
It might be some physical connection issue or Latency in between from your PA and remote end where you PA does not see
ISAKMP R-U-THERE-ACK” acknowledgement from the other side.
Did you try to disable the DPD ?
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