Communication can be initiated from one side only

  • Hi,

    I've an ipsec tunnel up.

    Problem : Remote router can't ping local router until local router firstly ping remote router.

    After that every thing works fine, communications go fine on both sides.

    But if no communication is done for a while, then problem starts again (remote can't ping local until local has pinged remote first)

    That's strange and I would like to know if someone has heard of it before.

    Thank you.


  • In my experience this is generally caused by the Interesting Traffic not matching EXACTLY on both firewalls.

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