If your speed tests show speeds capped at 100 Mbit/s despite having a faster broadband connection, the issue is likely your router's WAN port limitation. Many entry-level routers only support 100 Mbit/s on the WAN interface, which connects to your fiber modem. To achieve speeds above 100 Mbit/s, you need a router with a Gigabit (1000 Mbit/s) WAN port.

How to resolve this

  1. Step 1: Check your router's WAN port specifications

    Search for your router model online and look for the technical specifications. Find the section describing the WAN port (the port that connects to your fiber modem) and check if it supports 1000 Mbit/s (Gigabit) or only 100 Mbit/s (Fast Ethernet).

  2. Step 2: Verify which port is the WAN port

    The WAN interface is typically labeled "WAN", "Internet", or has a different color than the LAN ports on your router. This is the port where your fiber modem cable should be connected.

  3. Step 3: Upgrade your router if necessary

    If your router's WAN port only supports 100 Mbit/s, you will need to replace it with a router that has a Gigabit WAN port to utilize speeds above 100 Mbit/s.