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Forum Discussion
R7800 poor WAN download upload rate when a client is connected at 100Mbps
Latest stock firmware.
Just found out a new unpleasant discovery. WAN slowdown bug when there is simultaneous LAN traffic with 100Mbps device involved in the LAN traffic.
I have 3 devices connected to the R7800 LAN ports - two Android TV boxes and a 4K TV (all with 100Mbps NICs! This is really important to trigger the bug).
A desktop PC is connected at 1Gbps to the R7800 LAN port 4. There is a Plex server installed on the desktop PC.
When a 4K movie with bitrate ~70Mbps is played on the TV box and on the 4K TV set, the Internet (WAN) download/upload speeds on the desktop PC or on any other device connected by cable drop dramatically from 940/680 Mbps with 1ms ping to just anything between 25-350/100-200Mbps. The speedtest results are really low and inconsistent (varying hugely from as low as 25Mbps to 350Mbps) with high ping from 50 to over 350 ms.
I can hardly reach the speeds on the below picture during a LAN traffic from a desktop PC streaming two 4K movies with video bitrate around 70Mbps to Android TV (playing the movie) and Android Set-top box.
I can reproduce this using iperf3 to create LAN traffic between two or more LAN clients.
If I connect a Laptop with 1Gbps connection instead of 100Mbps device, the WAN slowdown doesn't occur.
But it does occur when I connect the same Laptop but with 100Mbps cable (4 wires).
I have this WAN down/up speeds limitation only during active LAN transfer/s between a PC and another 100Mbps LAN client/s. You need simultaneous WAN and LAN transfers. I use iperf3 to better shape the scenario.
Otherwise this doesn't occur.
For me this is unacceptable because when anyone is watching on a TV set (100Mbps) movie streamed over a LAN (PC at 1Gbps as a server - TV set as a client) the PC (1Gbps) can download/upload from/to WAN at very low speeds. And all other 100 Mbps devices involved in LAN transfers cannot download either.
A separate Laptop connected at another port at 1Gbps can download at full speed from WAN as long as it doesn't take part in simultaneous LAN traffic with another 100Mbps device.
Obviously a complicated but real life scenario.
I've used three routers - two different R7800s (to reject it is a hardware problem only) and cheap no-name gigabit router with Ralink chipset.
The cheap router doesn't have this issue when performing absolutely the same tests. It easily achieves simultaneous full WAN/LAN speeds.
19 Replies
What Firmware version is currently loaded?
What is the Mfr and model# of the Internet Service Providers modem/ONT the NG router is connected too?Tried installing a non managed Gb LAN switch in between the router and these devices?
What CAT# Lan cable are you using? CAT6 is recommended.
Is QoS, Armor, or Traffic Meter enabled on the router?
Has a factory reset and setup from scratch been performed since last FW update?
Something I don't see with mine:
Though my 3 Dish network Joeys are connected behind switches...
R7800 Firmware Version 1.0.2.90
I've tried with non managed Gb LAN switch but as long as there are devices connected at 100Mbps and they transfer over LAN the WAN speeds drop dramatically.
None of the QoS, Armor, or Traffic Meter are enabled on the router.
Factory reset and setup from scratch doesn't make any difference.
I stress that WAN speeds drop occur only when there are 2 or more devices connected at 100Mbps that transfer data over LAN (I use iperf3 here to reproduce/trigger the WAN bug) and you perform WAN speed test at the same time from desktop PC connected at 1Gbps that takes part in LAN transfers too (around 200-300 Mbps LAN traffic to both 100Mbps clients). Sometimes WAN speed is still decent but there are LAN speed drops.
This doesn't happen if all the devices are 1Gbps. Only happens with two or more 100Mbps devices connected taking part in simultaneous WAN and LAN traffic.
I'd be curious if Voxels 3rd party FW does the same thing.
What is the brand of model of the switched you tested with?
What CAT# cables are you using?
What is the Mfr and model# of the Internet Service Providers modem/ONT the NG router is connected too?
