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Add a flow on the server to the ipsec.conf:


       ike dynamic esp from any to any main auth hmac-sha1 enc aes
                           quick auth hmac-sha1 enc aes 
                           psk "secretkey"



Add a flow on the client as well:


       ike esp from any to any peer 10.1.1.1 main auth hmac-sha1 enc aes
                     quick auth hmac-sha1 enc aes
                     psk "secretkey"


Voila!