Lost IPv6 After Upgrade to Fios 2‑Gig (ONT Swap) — Need Network Engineering Check

tngvmd

Hi,

I recently upgraded from Fios 1‑Gig to Fios 2‑Gig. Before the upgrade, my connection had fully working IPv6 with DHCPv6‑PD. After the ONT replacement for 2‑Gig service, IPv6 no longer works — my router receives no WAN IPv6 address and no DHCPv6 prefix delegation.

I have already worked with Tier 1 support and went through all of the standard steps: router reboot, ONT reboot, router factory reset, and full configuration review. None of these resolved the issue. Tier 1 ultimately told me to “check back in the future,” but I have since learned that Network Engineering has resolved this exact IPv6 issue for other customers who lost IPv6 after upgrading to 2‑Gig and receiving a new ONT.

To be clear:

• IPv6 worked perfectly on this same router and configuration before the ONT swap
• The loss of IPv6 occurred immediately after the new 2‑Gig ONT was provisioned
• My router now receives no WAN IPv6 address, no DHCPv6‑PD prefix, and no RA/DHCPv6 responses from the network

This strongly suggests that my new ONT was placed on an OLT segment that is not IPv6‑enabled. This is a backend provisioning issue, not a CPE issue, and cannot be resolved through additional router troubleshooting.

I need a Verizon representative to open a Network Engineering ticket to check:

1. Whether my new 2‑Gig OLT segment is IPv6‑enabled
2. Whether my ONT was provisioned on a segment that does not support DHCPv6‑PD
3. Whether my previous IPv6‑enabled segment can be restored or my current segment can be IPv6‑enabled

Please contact me via private message for account details.

Thank you.

Capricorn1

I have read in previous posts (on Reddit r/Fios) that IPv6 is not deployed on the network used by the 2 Gbps service. That's counterintuitive for sure, but I believe that's the way it is. One post I found is from about two years ago. The latest post mentioning losing IPv6 with the 2 Gbps service was about 19 days ago. There was supposed to be a firmware fix in the works, but it's been a long time.

I've also heard that Verizon might be moving their multi-gig service (of which 2 Gbps is the only current offering) to a newer technology. That would require another equipment change, but apparently, its what Frontier is using. When the Frontier acquisition is complete, they might switch over and deploy IPv6.