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How do I troubleshoot IPv6 connectivity?

When IPv6 is unreachable, first determine whether the issue is server configuration or your local network not having IPv6 connectivity.

Test from external locations first​

Use a third-party IPv6 ping test website to test your IPv6 address from multiple regions.

If external nodes can reach it but your local network cannot, the issue is usually with your local network or ISP IPv6 routing.

Check server configuration​

Run inside the server:

ip -6 a
ip -6 r

Confirm that the server has an IPv6 address and a default IPv6 route.

Common causes​

  • The local network does not have IPv6 connectivity.
  • The system is missing an IPv6 default route.
  • The firewall blocks ICMPv6 or related ports.
  • Some third-party websites actively restrict data center IPv6 addresses.

When submitting a ticket, please provide ip -6 a, ip -6 r, and external test screenshots.