Confirm availability
First check that the offer and the box really provide IPv6. A local address starting with fe80:: does not prove access to the Internet: each IPv6 interface normally has one for the local link.
Control addressing and route
The device must be given a global or network-appropriate address and a default route. Depending on the architecture, this is done through router ads, DHCPv6, or both. Inconsistent manual configuration can prevent packets from returning.
Distinguishing between DNS and connectivity
A name can fail while a direct IPv6 destination remains reachable, or vice versa. So compare AAAA resolution, route, and access to a known destination. Avoid permanently disabling IPv6 just to hide a DNS outage.
Firewall and packet size
IPv6 depends on ICMPv6 for neighbor discovery and some path information. Excessive filtering can break connectivity. Maintain a firewall policy, but allow essential ICMPv6 messages.
Frequently asked questions
Does a fe80:: address give access to the Internet?
Not alone. It is used for the local link and does not replace a global IPv6 address and route.
Should you disable IPv6?
This is not a lasting correction. It is better to identify whether the failure is due to the operator, router, DNS or firewall.
Reference sources
To be explored next
Published and verified by the VoirMonIP.com team on July 15, 2026.