AutoVPN Registry Communication (Control Plane)9350–9381, Is used to register public IP, NAT port, peer discovery. https://documentation.meraki.com/SASE_and_SD-WAN/MX/Design_and_Configure/Configuration_Guides/Site-to-site_VPN/Meraki_Auto_VPN_-_Configuration_and_Troubleshooting IPsec Tunnel Traffic (Data Plane)32768–61000 (ephemeral, per-MX), is used for actual encrypted ESP-over-UDP between MX peers. Automatic NAT Traversal for Auto VPN Tunneling between Cisco Meraki Peers - Cisco Meraki Documentation Documentation is your best friend. 😉
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