added link

Author: marciocloudflare

src/content/docs/magic-wan/configuration/manually/third-party/fortinet.mdx

@@ -95,6 +95,8 @@ fortigate # config vpn ipsec phase1-interface
         set nattraversal enable
 ```
 
+Refer to [Fortinet's documentation](https://community.fortinet.com/t5/FortiGate/Technical-Tip-IPSec-VPN-NAT-traversal/ta-p/197873) for more details.
+
 ### Disable anti-replay protection
 
 For route-based IPsec configurations, you will need to disable anti-replay protection. The command below disables anti-replay protection globally, but you can also do this per firewall policy. Refer to Fortinet's documentation on [anti-replay support per policy](https://community.fortinet.com/t5/FortiGate/Technical-Tip-Anti-Replay-option-support-per-policy/ta-p/191435) to learn more.