Ipsec died and ping_hosts.sh

[Arthur]

i have two pfsense and an ipsec tunnel between eachother.
sometime ipsec dead ! it loooks like alive and it's green in "status/ipsec" but i can"t ping throw !
if i restart raccon service then all is ok.

So i would like to make a cron job to restart automaticly raccon service if the ipsec tunnel is dead.

How i can make this ? is there somebody  alerady do this ?

i have found the /etc/ping_host.sh script that talk about a mysterious field4 (script to run when service is down), but how can i use it ?
if i had something in /var/db/ipsecpinghosts then it's reset when i change my ipsec settings via the web interface.

thanks for any help