Nest Wifi router (H2D) with Cox Cable modem - bottlenecking performance

[doctacarta85]

Afternoon -

I have a Nest Wifi router (model#H2D) with a Cox Cable Panoramic modem/router in bridge mode. I would say over the past 6 months or so I experience random performance degradation i.e. I pay for close 500mbps down but speed tests whether through Google app, hardware wired PC or mobile devices show down speeds of 90mbps. When I hardwire from Cox modem to my PC this is not an issue. Generally a quick way for me to resolve this issue is to turn off both devices, wait ~5-10min then turn them back but unfortunately the solution only lasts 1-2 weeks.

I am getting to the point of trying to walk into my local Cox store and replace my panoramic modem. I've called Cox multiple times but they always say things look "fine" on their end and have even sent someone to my home to check my infrastructure which came back great. The times I've called Google they executed a diagnostics report, which unfortunately I no longer have the email, saying they show poor KPIs between your Google router and Cox modem and to call Cox - ugh.

I want to say a month or so ago, I came across a thread on here via Google searching talking about known issues between these two device or am I making it up in my head? 😉

Any input/advice would be greatly appreciated!

Cheers

[LovelyM]

Hello doctacarta85,

Thanks for posting — let’s see what’s going on.

Ensure that you're using a Cat5e or Cat6 Ethernet cable. Check if the cable that you are using is securely plugged in and if there's no damage to it. Please try these troubleshooting steps and let me know if any of them help.

• If you're using a modem/router combo, set it to bridge mode to avoid double NAT issues.
• Ensure that there is minimal to no interference (concrete, bulletproof glass, metal, mirror, etc.) and that the Wifi points are no more than two rooms apart.
• Remove any special characters from your network name and password.
• Turn off IPv6.
• Change your DNS servers to 8.8.8.8 on your primary and 8.8.4.4 on your secondary servers.
• Unplug the power from your modem and Google Nest Wifi devices for 2 minutes.
• If the issue persists, try factory resetting your network. Take note that this will remove all network data.

Looking forward to your response. 

Best, 
Lovely

[Dan_A]

Hey there,

I wanted to follow up and see if you still needed help. Please let me know if you still have any concerns or questions from here, as I would be happy to take a closer look and assist you further.

Regards,

Dan

[Dan_A]

Hey there,

We haven't heard from you in a while, so we'll be locking this thread if there is no update within 24 hours. If you need assistance or want to discuss topics, feel free to start a new thread.
 

Cheers,

Dan

[doctacarta85]

I've done a majority of this in the past without any luck. I have not done the DNS change - what's the reasoning behind the change so I can better understand? 

I did, on a limb, enable vIP6 this time and appears to have resolved my internet speed degradation issue so would be curious as to the "why" on turning it back off.

Thanks

[LovelyM]

Hi doctacarta85,

Usually, changing your DNS settings connects you to a closer or more optimized DNS server, eliminates redundant DNS server checks and ensures that all settings are communicated and saved properly on the Google Cloud servers. If you have a lot of devices connected to your network, enabling IPv6 allows your devices to get enough unique IP addresses to improve the performance of your network. There are some instances where disabling IPv6 is needed since some devices might not support it, causing them to drop off the network.

Let me know if you have other questions or concerns.

Thanks,
Lovely

[doctacarta85]

Should I still make your suggested DNS change even though my speeds appear to be back to "normal" now with IPv6 enabled? Thanks 

[LovelyM]

Hey doctacarta85, 

If everything is working as it should on your end, then there's no need for you to change the DNS settings. You can keep your network settings as they are right now. 

Fill me in if you have further concerns.

Regards, 
Lovely

[doctacarta85]

Looks like I am back to slow speeds. I am going to give your DNS suggestion a try. Thanks! 

[LovelyM]

Hi doctacarta85,

Sounds good! Let me know if that resolves the issue or not. 

Sincerely,
Lovely

[Markjosephp]

Hello folks,

Thanks for looking into this, Lovely.

@doctacarta85, I'm checking back in — how's it going? Still need our help?
 

Regards,

Mark

[Markjosephp]

Hello there, doctacarta85,

It has been a few days since your last reply, and we're going to lock the thread within 24 hours. If you have any questions, please feel free to create a new post.

Thanks,

Mark

[doctacarta85]

Unfortunately about a week or so after making your suggested DNS change the slow speeds came back. Any other ideas? Thanks 

[doctacarta85]

https://www.googlenestcommunity.com/t5/Nest-Wifi/Google-wifi-is-providing-half-the-speed-of-my-modem... Was there ever a solution to this thread? Sounds similar to my issue? Thanks 

[doctacarta85]

Looks like another issue related to mine after myself trying to resolve my issue via auto power cycle. https://www.googlenestcommunity.com/t5/Nest-Wifi/Scheduled-network-restart/m-p/58814/page/2

[LovelyM]

Hey doctacarta85,

Sorry for the late response. We'll have our senior specialist take a look into your issue, so please fill out this form and let me know once you are done.

Thanks, 
Lovely

[doctacarta85]

Done. Thanks for your help!

[Alex_S]

Hi there,

We got your form — thanks for filling it out. Our team will reach out to you via email anytime soon. Let us know if there is anything else we can help you with.

Warmly,
Alex