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VPN behaviour when lost connectivity

Hello , I have a site-to-site ipsec vpn tunnel working between 2 ASA routers.  I am trying to understand the behaviour of the tunnel after  a connection lost  (disconnecting ethernet cable) . Most of the times the tunnel  recovers phase 1, negotiates phase 2 and starts working normaly. Some other times i need to ping from one LAN to another to start the tunnel and finally  sometimes starts whenever the routers want .  Intiator and responder roles vary. In this tunnel there is traffic all the time.  Lifetime for rekey  phase 1 are 8 hours and for phase 2 is 1 hour, but i have never exceed  them making tests.

Is there any mechanism or  to make sure that the tunnel is going to  get working automatically after a connection lost? Any clue to understand this behaviour?

 

thank you.

 

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