Hello everyone,
I need help with a strange speed issue on my Netduma R3.
Setup:
· ISP router: Huawei H155‑381 (5G) — connected via Ethernet cable
· Netduma R3 in DMZ (R3’s WAN IP is in Huawei’s DMZ)
· PC wired directly to R3
Symptoms:
· When the PC is connected directly to the Huawei router (bypassing R3), I get 350–450 Mbps download.
· When the PC is connected through the R3, I only get 130–176 Mbps download.
· Ping is stable, Geo‑Filter works, but the download speed is capped.
What I have already tried (following forum advice):
· IPv6 disabled on both LAN and WAN of R3
· Congestion Control set to 70% / 70% and also tried 100% / 100%
· Congestion Control Mode = Always On
· Speedtest Bypass = OFF
· Tried UPnP on / off (currently off)
· Tried different Ethernet cables (CAT5e and CAT6)
· Tested with SmartBOOST enabled / disabled
· Confirmed that the WAN IP in Huawei’s DMZ is correct
· Factory reset of R3 and reconfigured
Nothing changed — the speed remains around 130–176 Mbps through R3.
Note:
I play Warzone competitively, so stable low latency is important. The speed cap itself does not affect gameplay, but I would like to understand why the router is limiting the throughput so much. Could this be a known bug, or am I missing a setting?
Thank you for any suggestions.
