IPsec VPN between fortigate (static ip) and TP-Link (no static ip)

Hello @ahmadmasalmeh ,

You might need to perform the dialup configuration on FortiGate so that it acts as a responder and the TP-Link router as the initiator. In this config, FortiGate will be listening for IKE negotiations from any device that has the desired config, like your TP-link router. I would suggest you go through the below documentation for this configuration and respond over here if something doesn't make sense. Good luck!

https://docs.fortinet.com/document/fortigate/6.2.15/cookbook/6896/fortigate-as-dialup-client

https://community.fortinet.com/t5/FortiGate/Technical-Tip-How-to-configure-a-FortiGate-as-IPsec-VPN-Dial-Up/ta-p/197552

Regards,