Zte F689 Bridge Mode -

Cause: Incorrect VLAN ID or PPPoE credentials. Solution:

Bridge mode is only half the battle. You must now configure your personal router (Device B) correctly.

Test: Your router's WAN IP should now be a public IP address (not starting with 192.168.x.x or 10.x.x.x). Zte F689 Bridge Mode

Now your ZTE F689 is a dumb bridge. It will not give your router an IP address. You must configure your router manually.

  • VLAN ID: Most personal routers do not need this, but if your ISP requires a VLAN tag on the WAN side, set it to the same ID you used in Step 4 (e.g., 100).
  • Save the settings and reboot your personal router.

    • Success indicator: Your personal router’s WAN IP should now be a public IP address (not starting with 192.168.x.x or 10.x.x.x). Cause: Incorrect VLAN ID or PPPoE credentials

    Cause: Your personal router is underpowered, or you are hitting a PPPoE software bottleneck. Solution: Ensure your personal router has a CPU powerful enough to handle gigabit PPPoE. Older routers (e.g., low-end TP-Link models) may struggle with PPPoE decryption, whereas the ZTE’s hardware offloaded it well. Upgrade your router or switch to a device with hardware NAT acceleration.

    Bridge mode on the ZTE F689 disables the router/NAT functions and passes the ISP’s public IP to a connected device (usually your own router or firewall), letting that device handle PPPoE/dhcp, routing, and firewalling. Test: Your router's WAN IP should now be

    Many ISPs remove the "Bridge" option from the standard user interface to prevent users from "breaking" their setup. If you cannot find the setting, you have two options:

    | Problem | Likely Fix | |--------|-------------| | Cannot delete or edit the existing Internet WAN profile | ISP has locked the firmware. Contact them to enable bridge mode, or ask for a “modem-only” mode. | | No internet after bridge mode | Double-check VLAN ID, PPPoE credentials on your router, and that your router’s WAN port is plugged into the correct LAN port on the ZTE F689. | | Still getting 192.168.x.x IP on router | Bridge mode not active; your router is behind NAT (double NAT). Re-check steps 3 & 4. | | Can’t access ZTE F689 after bridging | Normal – your router’s subnet now handles LAN. To re-access, temporarily set your PC’s IP to 192.168.1.100, subnet 255.255.255.0, then browse to 192.168.1.1. |

    | Problem | Likely Fix | |--------|-------------| | Can’t find bridge option | ISP firmware locked it. You may need to ask ISP to switch ONT to bridge mode remotely. | | No internet after bridge | Double-check VLAN ID and PPPoE credentials. Some ISPs require DHCP option 60/61. | | ONT resets to router mode | ISP TR-069 may override. Disable TR-069 or ask ISP to change config permanently. | | Slow speed | Ensure your router supports gigabit WAN and hardware NAT. |