Go to Network > WAN > WAN Connection . Create a new connection, select Route or Bridge , and explicitly enter the internet VLAN ID required by your ISP.
Once your firmware is stable, optimal configuration is the next step. The ZTE F609 is a robust Layer 2/Layer 3 gateway device supporting features like VLAN (802.1Q), QoS (Quality of Service), NAT (Network Address Translation), and Dual Stack IPv4/IPv6 capabilities. Firmware Zte F609 Xpon