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corockclimber's avatar
corockclimber
Aspirant
Oct 20, 2022

Nighthawk AX12 AX6000 max LAN speed

I have Xfinity Gigabit Extra plan at 1.2Gbps cable inter hooked up to a Nighthawk 2.5Gbps Cable Modem (CM2000). My computer has a Realtek Gaming 2.5GbE Family Controller and I am using Cat 7 ethernet cabling and connectors. When I connect my computer directly to the cable modem I get 1386Gbps down and 37Gbps up. When I connect the cable modem to the AX12 (Firmware Version V1.2.8.40) to the Yellow WAN internet connection, the best I can get is 864Gbps down and 41Gbps up. When connecting to the Multi-Gig and selecting the option in the UI WAN Preference to the 5G Ethernet port the download tanks to 170Gbps down and 3Gbps up....no that is not a misprint! 

 

I purchased this combo in hopes of obtaining the max speed give or take 15%, not 30% using the LAN connection and definitely not losing 90% going through the multi gigabit connection. 

 

What am I missing? I have tried multiple different cables and I think the router is just not going to give me max LAN speed.

 

I have utilized SpeedGuide and used the TPC Optimizer.

 

Windows 11 Pro - Version 22H2

Gigabyte Z390 Designare running F9 firmware.

64GB Memory

Realtek Gaming 2.5GbE Family Controller

Cat7 ethernet

 

Thank in advance!

 

 

3 Replies

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  • FURRYe38's avatar
    FURRYe38
    Guru
    Oct 20, 2022

    Since the router only has 1 multi gig port and the Yellow internet and 4 LAN ports are only 1000Mbps supporting, if your connecting the router to the modem using the multi gig port, and your PC is connected to the 1Gb ports, you'll not see any speeds over 1Gb with the LAN ports. You should see over 1Gb if you have a AX supporting WIFI adapter connected on 5Ghz. 

    The limitation is not having any multi gig LAN ports on this router. 

  • plemans's avatar
    plemans
    Guru
    Oct 20, 2022

    Something isn't reading right with your setup if you're reading 3gig up. As the CM2000 and xfinity don't support those speeds on the upload. 

    to start off with, don't trust the built in speedtest at multigig speeds. It rarely will max them out. I'd recommend using xfinity's speedtest as that's been the most accurate for me on xfinity. 

    The other thing is you won't see multigig speeds over the wired because it only has the 1 multigig port and you're using that for the wan port. What I usually tell people to do is run 2x wired speedtests at the same time. (if you have 2 wired computers). Or even just run 1 wired and wireless test. And again, test on xfinity's site.