What this page covers
Compare IPv6 address, default route and DNS delivery on the same authorised network.
Step-by-step workflow
- Check whether the client has a global IPv6 address or only link-local.
- Inspect the IPv6 default route and router status.
- Compare another client and wired/Wi-Fi paths.
- Check ISP prefix delegation and router IPv6 mode before disabling IPv6.
Decision table
| Check | What it tells you | Safe next action |
|---|---|---|
| Link-local only | The client lacks a usable global path | Check RA and prefix delegation |
| Global address, no route | Default-router information is missing | Inspect router advertisements |
| IPv4 works, IPv6 fails | Dual-stack branch is isolated | Compare ISP/router IPv6 status |
Limits and verification
IPv6 menu names differ by vendor. Disabling IPv6 can hide rather than fix a provider or router configuration issue.
Official sources
- IETF RFC 8415 — DHCP for IPv6 (DHCPv6 behavior)
- Microsoft — Essential network settings and tasks (Windows network fields and commands)
Related Router Portal guides
Router login troubleshooting · Find the current gateway
Keep in mind: Firmware, operating-system menus, ISP policies and regional radio rules can change. Confirm the current official source and exact device before applying a setting.
Our networking steps are lab-tested against standard RFC 1918 private networking protocols across Windows 11 (24H2), macOS Sequoia (15.1), iOS 18, and Android 15. We verify physical device labels and firmware release documentation before publishing gateway instructions. Router Portal is strictly read-only and never requests, intercepts, or logs router passwords.