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Forum Discussion
FattiesGoneWild
Jun 14, 2026Guide
RS700 ipv6 lost when modem drops
I have Spectrum cable internet and noticed when my modem loses connection. I lose ipv6 when it comes back up. If I reboot the router, IPv6 comes back. Thoughts? Using auto detect RS700, it selects DH...
FURRYe38
Jun 14, 2026Guru - Experienced User
Latest FW version?
Brand and model# of ISP modem?
How is IPv6 configured on the router?
Useing custom IPv6 DNS or Detected ISP IPv6 DNS?
Try some custom IPV6 DNS.
- FattiesGoneWildJun 14, 2026Guide
1.0.11.8
Technicolor ET2251
DHCP
ISP detected ipv6 dns
Prefer to use my isp since it’s all automatic. I’m puzzled why the router does not recover ipv6 once the modem comes back up, weird.
- FURRYe38Jun 15, 2026Guru - Experienced User
Please try custom IPv6 DNS add see if this happens again.
Also try the AUTO IPv6 setting as well.
I'll send this to NG for review.
- FattiesGoneWildJun 15, 2026Guide
What do you mean by AUTO IPv6? Do you mean auto config? I used auto detect and it set it to DHCP which sounds right to me being I’m on cable internet that uses it. 🤷 I don’t want to use custom dns, I understand for testing purposes. But that’s not exactly a fix if it’s firmware related. Thanks for passing it onto NG for they can look more into it. Hopefully other users will chime in with same results I’m seeing. Now I’m seeing why NG has IPv6 off by default. It can still run into issues. 🤷