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G34 Massive number of correctable codewords

  • October 2, 2025
  • 1 reply
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I am receiving a massive number of “Correctable Codewords”, billions in short time period.  Additionally IPv6 is unable to successfully negotiate.  It would appear that there is no way to completely shut down the IPv6, but I believe that is a secondary issue.

My ISP is Sparklight. I’ve contacted them numerous times over the past few weeks, however since I own this modem, they claim that they can’t help, even though they point out that they do see some packet loss.  The only thing they seem to be able to do is verify or perform a firmware upgrade. (I’m not sure how they are allowed that but can’t do anything else).

Sparklight had previously replaced the cable between the pole and my house, and adjusted signal levels.  I finally got them to send a Sr. tech out this afternoon but not holding my breath on a fix.

It’s a little disappointing that this modem, after being on Sparklight’s recommended list and only being a couple of months old is having such problems with connection.  Is it Sparklight, or is it the modem?

I am in process of getting a different ISP with a Fiber system.  Hopefully this will resolve the problem, but until that gets connected and verified with the G34, I’m stuck using my cell phone hotspot. 

Yes, it’s got the latest firmware.

It seems the vast number of codeword corrections and the failed IPv6 attempts are loading the modem CPU so much that it won’t respond on either wifi or hard wire connection, otherwise I’d provide log information.

Questions:

  1. I’m told this modem will work on the new ISP fiber network, although I’m not sure how it’s supposed to connect fiber to F connector.  Is it reasonable to expect this modem to work well on the fiber network?
  2. Even shutting down all of the IPv6 settings the modem will continue trying to negotiate. Why am I unable to completely shut off IPv6, or why is it not able to fully negotiate IPv6?
  3.  Why can I not get a voice to communicate with ARRIS regarding these problems?

 

Best answer by SURFboard Moderator

It appears that your connection is intermittent. Could you please confirm the internet speed plan you’re currently subscribed to?

Also, does the intermittent connectivity occur over Wi-Fi, a wired connection, or both?

To help improve Wi-Fi performance, ensure that the gateway is placed at a higher elevation to minimize signal congestion and interference.

If the issue persists on both Wi-Fi and wired  we recommend checking the cable signal levels within the gateway. If the signal levels are out of the acceptable range, they can lead to the kind of connectivity issues you're experiencing.

When the signal levels are within the recommended range, your gateway can maintain a stable, high-quality connection to the internet

Please refer to the link below for instructions on how to check your cable signal levels:

http://arris.force.com/consumers/articles/knowledge/G34-G36-Cable-Signal-Levels

If you find that the signal levels are not within the recommended range, we suggest contacting your Internet Service Provider (ISP) to have them reviewed and adjusted as needed.

Regarding IPv6, please note that there is no option to disable it. If your internet provider supports both IPv4 and IPv6, the gateway will automatically obtain both and assign private IPv4 and IPv6 addresses to the devices connected to your network.

If you're planning to switch to a fiber optic connection via Ethernet, you can connect the G34 gateway directly to it.

For phone support, please visit our support platform at www.arris.com/consumersupport. Once there, you can click on the Call option to reach our support team.

 

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It appears that your connection is intermittent. Could you please confirm the internet speed plan you’re currently subscribed to?

Also, does the intermittent connectivity occur over Wi-Fi, a wired connection, or both?

To help improve Wi-Fi performance, ensure that the gateway is placed at a higher elevation to minimize signal congestion and interference.

If the issue persists on both Wi-Fi and wired  we recommend checking the cable signal levels within the gateway. If the signal levels are out of the acceptable range, they can lead to the kind of connectivity issues you're experiencing.

When the signal levels are within the recommended range, your gateway can maintain a stable, high-quality connection to the internet

Please refer to the link below for instructions on how to check your cable signal levels:

http://arris.force.com/consumers/articles/knowledge/G34-G36-Cable-Signal-Levels

If you find that the signal levels are not within the recommended range, we suggest contacting your Internet Service Provider (ISP) to have them reviewed and adjusted as needed.

Regarding IPv6, please note that there is no option to disable it. If your internet provider supports both IPv4 and IPv6, the gateway will automatically obtain both and assign private IPv4 and IPv6 addresses to the devices connected to your network.

If you're planning to switch to a fiber optic connection via Ethernet, you can connect the G34 gateway directly to it.

For phone support, please visit our support platform at www.arris.com/consumersupport. Once there, you can click on the Call option to reach our support team.