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How to determine an initiator and responder in L2L - IPSEC VPN

Hi Guys,

One of the client im working on has requested me to change the inititator from site A to site B. Currently, Site A is the initiator and  Site B is the responder. The reason is the client could not access any sub-client site from Site A. In case the tunnel goes down, they want Site B to initiate traffic to Site A. I am not sure how to change a VPN tunnel to be a initiator(site b) and responder(site a) accordingly or is this an automated process. I understand that it doesnt matter since however, it still nedds to negotiate SA and policies for tunnel establishment, but is there a manual way for doing it via ACL or ISAKMP policy? Or is there any parameters we can set to control this?

Both firewalls is ASA 5500 Series (5520).

Please help. Appreciate it.

Thank you.

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