VPN Tunnel Flapping

L1 Bithead

VPN Tunnel Flapping

Hello all,


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:


-Event: ikev2-nego-ike-dpd-dn

-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?




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