Authentication required
The ISP MAC address cache is locked onto your old PC setup instead of the new router.
Enabling "Bridge Mode" essentially turns the ZTE F689 into a simple "dumb" modem, passing the public IP address directly to your own router. Step-by-Step Guide to Enabling Bridge Mode on ZTE F689
Log into the management interface of your personal router to finalize the connection. zte f689 bridge mode exclusive
Log back into your new router and verify that the authentication credentials or VLAN IDs exactly match your original ISP spec.
Here is the "exclusive" trick most guides miss: You cannot simply add a second rule. You must the existing routing rule before creating the bridge. The ISP MAC address cache is locked onto
Log into your new router's setup wizard via its app or IP address. Select your connection type:
Set to TAG and enter your internet VLAN ID (check your original connection or contact your ISP). Also, ensure Enable VLAN is checked and Service List is set to Internet . Log back into your new router and verify
When the "Bridge" option is missing from the WAN settings dropdown, use this advanced method to unlock bridge mode:
Connect a computer directly to the ZTE F689 using an Ethernet cable.