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L2L VPN between ASA (Checkpoint firewall NATing) and 3rd party device

I have connectivity problem setting up Site-to-site VPN,My ASA (no nat enabled) device is behind Checkpoint Nokia box (nokia does one-to-one NATing using unique global IP address for outside interface of ASA,in addition I have webmail and remote access working no problem on Cisco ASA.I have inbound L2L VPN working but outbound facing problems,

Someone suggested enabling static mapping for ESP protocols have checked and I don't think it can be done on Checkpoint?!

I see no connection being dropped on Checkpoint as well,

Any help is highly appreciate

  • Firewalling