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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...
Thank you for the recommendation but after trying this, I’m still seeing the same 400Mbps to 500Mbps download speed on my LAN interfaces. Getting around 700Mbps to 800Mbps to the exact same server via Ookla on WiFi 6. Double checked and made sure that the connected LAN devices are negotiated at 1Gig and the WAN port itself is at a negotiated speed of 2.5Gig as well. All cable runs are Cat 6a and above with connection between the RAX120 and the CM2000 being a Cat 8 cable.
Mitchell7887 wrote:Thank you for the recommendation but after trying this, I’m still seeing the same 400Mbps to 500Mbps download speed on my LAN interfaces. Getting around 700Mbps to 800Mbps to the exact same server via Ookla on WiFi 6. Double checked and made sure that the connected LAN devices are negotiated at 1Gig and the WAN port itself is at a negotiated speed of 2.5Gig as well. All cable runs are Cat 6a and above with connection between the RAX120 and the CM2000 being a Cat 8 cable.
When you went through the process, did you make any changes in your existing configuration?
What specific Ethernet connected devices are your testing on? How are you testing?
Have you connected a computer direct to your modem to verify what throughput your ISP is delivering?
Nope. No configuration was changed. The 2.5Gig port was already the preferred WAN interface. Testing with my PC and a separate laptop that are both connected via Cat 6a and are negotiating at 1gig with the RAX120. Verified with iPerf that both the PC and laptop are only able to get a max throughput in the 300Mbps range between each other and with WLAN devices as well.
I did bypass the RAX120 to tested directly from the CM2000 interface earlier today and was getting the expected 1gig speeds. Also ran a Speed test from the RAX120 WAN interface as well and was getting the expected download speed of over 1.2Gigs.
Have a feeling that this might be an hardware issue with something on the LAN interfaces NPUs. This is my only NetGear equipment so not too familiar with their designed as I mainly work with Cisco equipment day to day.
Mitchell7887 wrote:Nope. No configuration was changed. The 2.5Gig port was already the preferred WAN interface. Testing with my PC and a separate laptop that are both connected via Cat 6a and are negotiating at 1gig with the RAX120. Verified with iPerf that both the PC and laptop are only able to get a max throughput in the 300Mbps range between each other and with WLAN devices as well.
I did bypass the RAX120 to tested directly from the CM2000 interface earlier today and was getting the expected 1gig speeds. Also ran a Speed test from the RAX120 WAN interface as well and was getting the expected download speed of over 1.2Gigs.
Have a feeling that this might be an hardware issue with something on the LAN interfaces NPUs. This is my only NetGear equipment so not too familiar with their designed as I mainly work with Cisco equipment day to day.
If you are getting 1.2 Gbps downstream from the router, the router and modem are doing their jobs. I presume you are working with Windows devices? If not, please say so.
For Windows, make sure your network profiles on each machine are classified as private and not public. When you installed a new modem, Windows possibly sensed a new network and automatically classified it as public. See attached screen snip from a Windows 10 machine.
For data transfer rates between machines, do an internet search for SMBv1, SMBv2, and SMBv3 and Windows. Lots of reading material.
Yes, there both running Windows 10. Just doubled checked to make sure that there still set to Private which there are. Thank you for the guidance on looking into the SMB stuff. Going to do some research on that tomorrow as I didn’t think of looking into that for this issue yet. Also going to try out testing two Linux machines as well on the LAN interface just to be extra safe tomorrow or later this week. Thank you for your help on this today!
