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In every VPN community there is option to disable NAT for this community. Not sure if this is valid also for NAT-T traffic.
If you see issue with NAT-T, I would suggest to contact TAC and investigate it.
NAT-T is used because there is some NAT device in between 2 peers. In order to keep connection in NAT device connection table, Check Point firewall is using NAT-T as keepalive packets every 10 seconds (even if there is no interesting traffic).
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