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Question

S33 modem unable to find serial number

  • November 29, 2025
  • 5 replies
  • 17 views

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Hello

 

I have an S33 that I need support on and the warranty checker can’t verify the serial number.  I need to troubleshoot some IPv6 issues I’ve been having with Spectrum.

 

Thanks!

5 replies

plemans
Juggernaut
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  • Juggernaut
  • November 29, 2025

IPv6 has been broken for a while with several ISP’s. I usually recommend users disable it on their router. And there really isn’t anything to change on settings for the S33


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  • Author
  • The Many
  • November 29, 2025

Some services I use (like Home Assistant/Nabu Casa) seem to favor v6 for remote access.  It was working flawlessly until recently, and every tech I get says it should be working.


plemans
Juggernaut
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  • Juggernaut
  • November 29, 2025

Thats the issue I’ve ran into with IPv6 on multiple brands of routers and even DIY routers. It’ll work for a while and stop. One thing that helped my stability was using my own DNS server versus the ISP IPv6 based dns server. That helped with ipv6 stability. It wasn’t perfect but it was better. 


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  • Author
  • The Many
  • November 29, 2025

I figured out the problem, it was VyOS.  Installing OPNSense fixed it, which is what I wanted to do in the first place.


plemans
Juggernaut
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  • Juggernaut
  • November 29, 2025

You might watch it for a while. Mine would be stable for a few days and then suddenly go down. My devices would need a “refresh” or 2 sometimes to get things to load and it was the IPv6 causing the problem.