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Forum Discussion

tslo's avatar
tslo
Aspirant
Oct 28, 2016
Solved

R7500 slow LAN speeds with Arris 6190 cable internet modem

I activated a new cable internet modem today and my LAN throughput, as measured via speedtest.net, dropped significantly   Internet Provider: Comcast, Tier: Performance Pro Setup: Arris SB6190 -- ...
6190
arris
comcast
Nighthawk
R7500
r7500v2
sb6190
Troubleshooting
  • tslo's avatar
    tslo
    Nov 04, 2016
    JamesGL wrote:

     

    I think you may need to replace the new modem. It shows that the router is working when using the old modem. Changes has been made when using the new modem but still the same.

     

     

    Hi James,

     

    Thanks for the reply.

     

    The test also shows that the modem works fine without the router; wired connection is fine. 

     

    So, Arris says it's the modem ("we're just a pass through"); Netgear says it's the router.

     

    Also, WiFi throughput was fine.  The issue was specific to LAN throughput.

     

    So, to me, this indicates some issue with the router/modem communication. 

     

    Hard to tell which is the culprit, but the fact remains that the only thing that changed was the modem.

     

    My resolution: switch the hardware back to the SB6120, return the 6190 and use that setup until it dies or is obselete (or not able to provide the speeds available with the Xfinity internet tier that I've purchased).

     

    Thanks... 

tslo's avatar
tslo
Aspirant
Oct 29, 2016

I switched back to the older Motorola SB6120 modem tonight and had Comcast reactivate it.

 

Immediately went back to speedtest.net reported speeds, at my Windows PC, of 81.24Mbps down/6.08Mbps up, through the router-- no other changes.

 

Although I'm not using QoS, I have used the embeded speedtest in the admin console to report some speed metrics at the router.  That speedtest really doesn't show that much of a decrease in overall speed with the old modem, 89.36/6.10 (SB6190) vs 89.72/6.69 (SB6120).

 

Although I'd really like to figure it out, at this point I'm going to return the modem in a couple of days if I can't, given no real performance difference for internet service tier that I have.  The R7500's wireless signal is really good for my old lathe/plaster house, so it's worth keeping my current setup.

 

Would still be open to any suggestions, as I really would like to know why this is happening.  Thanks

 

 

 

 

JamesGL's avatar
JamesGL
Master
Nov 04, 2016

Hi tslo,

 

We’d greatly appreciate hearing your feedback letting us know if you need further assistance.

 

JamesGL

Community Team