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Guide

Jan 08, 2020

CM1200 to Rax200 WAN aggregation slows down (requires reboot)

I have a CM1200 modem and RAX200 Router with WAN agreggation (2Gig). My internet speeds slow down to 25Mb after approx 24 hours. Rebooting the router fixes the issue for another 24 hours and then the...

Apprentice

Feb 09, 2020

I have a RAX80 with the CM1200. Same issue, it slows down to 30Mbps after sometime and have ot reboot. In addition when link aggregation is setup, xfinity speed tester reports lower speeds than when it is disabled.

Virtuoso

Feb 09, 2020

I too am seeing a decrease in download speeds when WAN Aggregation is enabled between a RAX120 router (1.0.1.114) and a CM1200 modem (1.02.02) with 1000Mbps service from Xfinity, as measured by the Internet Speed test on the Nighthawk App (2.4.19.1).

behshad
Tutor
Sep 02, 2020
Checkout the following link for your question:

https://community.netgear.com/t5/Nighthawk-Routers-with-WiFi-6-AX/RAX120-WAN-Port-Aggregation-To-CM1200/m-p/1760418#M1551

I have my port aggregation turned off on CM1200 and just using the Internet port on RAX120. Just didn't want any link aggregation while troubleshooting the Cm1200 modem connectivity issue.
- behshad
  Tutor
  Sep 25, 2020
  Still roubleshooting the issue (3 months now). Don't use Link Aggregation basically changed everything (coax cable, ethernet cable, etc.etc.)
  
  However, I did notice the firmware on CM1200 (Comcast) got upgraded to V3.02.01 this morning. Looking for release notes for V3.02.01 and not published on NetGear yet.
  - michaelkenward
    Guru - Experienced User
    Sep 25, 2020
    behshad wrote:
    
    Looking for release notes for V3.02.01 and not published on NetGear yet.
    
    It won't be. Netgear cannot publish firmware for CMXXXX devices because cable ISPs don't allow it.
    
    What’s the latest firmware version of my NETGEAR cable modem or modem router? | Answer | NETGEAR Support
    
    If your firmware is outdated, you cannot manually upgrade your cable modem’s or modem router’s firmware. You must contact your Internet service provider (ISP) to upgrade your firmware.