https://community.three.co.uk/t5/Broadband/5G-Speed-Cap-Bottleneck-in-Bridge-Mode-Configuration/m-p/68225#M10864 <P>• Performance Gap: Currently seeing 500-550Mbps directly from the ZTE MC888A, but speeds drop consistently to ~100Mbps when using Bridge Mode with a GL.iNet Flint 2 router.</P><P>• Signal Strength: Hardware reporting excellent reception with an RSRP of -76 dBm, confirming the issue isn't signal-related.</P><P>• Hardware Handshake: Verified a 1000Mbps full duplex physical link between devices; however, throughput remains throttled.</P><P>• Troubleshooting Steps Taken:</P><P>• Switched to `3internet` APN with PDP type set to IPv4.</P><P>• Cloned ZTE MAC address onto the secondary router.</P><P>• Adjusted MTU settings (1420/1380) and enabled Hardware Acceleration.</P><P>• Tested in Access Point mode, which restores speed, indicating a specific routing/handshake conflict in Bridge Mode.</P><P>• Location Discrepancy: IP Geolocation intermittently reporting locations like Armagh or Amsterdam, suggesting potential routing or CGNAT "tunneling" issues affecting the connection.</P><P>Seeking advice from the community or Three tech support on whether this is a known firmware bug with the MC888A's bridge implementation or a network-level throttle on third-party routing.</P> Sun, 26 Apr 2026 10:45:31 GMT cosmicflow666 2026-04-26T10:45:31Z https://community.three.co.uk/t5/Broadband/5G-Speed-Cap-Bottleneck-in-Bridge-Mode-Configuration/m-p/68225#M10864 <P>• Performance Gap: Currently seeing 500-550Mbps directly from the ZTE MC888A, but speeds drop consistently to ~100Mbps when using Bridge Mode with a GL.iNet Flint 2 router.</P><P>• Signal Strength: Hardware reporting excellent reception with an RSRP of -76 dBm, confirming the issue isn't signal-related.</P><P>• Hardware Handshake: Verified a 1000Mbps full duplex physical link between devices; however, throughput remains throttled.</P><P>• Troubleshooting Steps Taken:</P><P>• Switched to `3internet` APN with PDP type set to IPv4.</P><P>• Cloned ZTE MAC address onto the secondary router.</P><P>• Adjusted MTU settings (1420/1380) and enabled Hardware Acceleration.</P><P>• Tested in Access Point mode, which restores speed, indicating a specific routing/handshake conflict in Bridge Mode.</P><P>• Location Discrepancy: IP Geolocation intermittently reporting locations like Armagh or Amsterdam, suggesting potential routing or CGNAT "tunneling" issues affecting the connection.</P><P>Seeking advice from the community or Three tech support on whether this is a known firmware bug with the MC888A's bridge implementation or a network-level throttle on third-party routing.</P> Sun, 26 Apr 2026 10:45:31 GMT https://community.three.co.uk/t5/Broadband/5G-Speed-Cap-Bottleneck-in-Bridge-Mode-Configuration/m-p/68225#M10864 cosmicflow666 2026-04-26T10:45:31Z