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ZenWiFi BT10 — Extreme download/upload asymmetry on mesh node via MoCA backhaul

CraigBee

Occasional Visitor
BT10 mesh (2 nodes). Google Fiber 3 Gig. MoCA 2.5 backhaul (GoCoax, 2.5 Gbps) between house and barn.
Problem: Barn mesh node: download capped ~270 Mbps, upload hits ~1.5-1.7 Gbps. Main node in house tests fine. Ran at full speed for over a year — issue started ~1-2 months ago.
What I've tried:

Firmware downgrade to October 2025.
Full factory reset on both nodes (no config restore)
Replaced the GoCoax MoCA adapters at both ends

Upload speed on the barn node proves the MoCA link and WAN are fine. Something is throttling download specifically through the mesh node.
No QoS, no AiProtection, no traffic analyzer enabled, no MLO. Everything at default.
Anyone seen directional throughput issues on BT10 AiMesh nodes? Feels like a backhaul-to-LAN forwarding issue in the download direction only.
 

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