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Slow LAN throughput on RAX120 since upgrading modem to CM2000
After upgrading my connecting modem to a NETGEAR CM2000, my RAX120 has seen a dramatic loss in throughput only to LAN interfaces. Speeds went from full 1Gig down to 500Mbps when only using a LAN inte...
Mitchell7887 wrote:After upgrading my connecting modem to a NETGEAR CM2000, my RAX120 has seen a dramatic loss in throughput only to LAN interfaces. Speeds went from full 1Gig down to 500Mbps when only using a LAN interface after upgrading the modem. WiFi Speeds have stayed the same at around 800Mbps down via WiFi 6 and speed tests from the WAN port on the RAX120 are showing the correct speeds of over a gig.
Tried new cabling to be safe and tested throughputs between all my LAN that are connected via the LAN interfaces and was only getting around 250Mbps to 300Mbps between each of them. Not running any QoS, Traffic monitoring, etc.. that might be causing bandwidth or processing restraints on the RAX120.
What I’m thinking is that since the WAN port was originally negotiating at 1gig on my old modem and then activating the multi gig interface (2.5Gig) when I upgraded, the memory allocation to each of the LAN interfaces might have gotten reduced to support the multi gig interface. This is the only thing I can think of but have no proof or knowledge of verifying that to be true. Would anyone else might know what is going on here or might have had the same or similar issue?
Log in to your RAX120 and go to the Advanced -> Setup -> Internet Setup menu. Select as your WAN port preference your multi-gig port. When you do this, your 1 gig WAN port on the back of your router has to remain with no Ethernet connections.
The Ethernet cable between the multi-gig modem output and your RAX120 multi-gig input is recommended to be Cat 6a. Short term, a good quality Cat 5e or Cat 6 will work for testing.
When you make changes to the configuration or the cabling connections you need to completely power down your LAN and perform a sequential startup. This allows the changes to take effect and the hardware to catch up.
Power down your modem and disconnect the Ethernet output cable. Power down your RAX120 (pull the power cord) and disconnect all Ethernet connections.
Power up your modem and give it ample time to boot and stabilize. One of the last indicators to illuminate will be the one for internet connection. Connect an Ethernet cable between the output of the modem and the multi-gig WAN port on your RAX120. No connection to the 1 gig WAN input port. Power up your router and give it plenty of time to boot and stabilize. One of the last indicators to illuminate will be the one for internet connection.
Use and Ethernet cable and connect a real computer to one of the four 1 gig output ports on the router and use a web browser to log in to your user interface. Go to the Advanced tab and Advanced Home screen. Click on the Show Statistics button and it will list your connections. The WAN connection should be multi-gig and when connected, the four LAN ports should be 1000M/Full.
Connect the rest of your network and test away. Recommend you use the Ookla native operating system application for testing (available in the play store).
Attached is a screen snip of the connection between my CM2050V and R9000. I use an SFP+/RJ45 adapter on the R9000 and a Cat 6a cable to the modem. Note no connection to the LAN 0 port.
Kitsap wrote:
When you make changes to the configuration or the cabling connections you need to completely power down your LAN and perform a sequential startup. This allows the changes to take effect and the hardware to catch up.
It can also help to reset the router so that it forgets any settings it had with the older modem.
Follow that startup sequence and it will configure itself to work with the new modem.