Disabling IPv6 usually has little effect on everyday internet use, because most connections still work over IPv4. It can sometimes fix specific connectivity, VPN, or DNS issues, but it can also break services that rely on IPv6 and may slow certain connections. Modern systems are built to use IPv6 when it is available, so leaving it on is generally the better default unless you are troubleshooting.
Why this happens
IPv6 is the newer internet addressing system that exists alongside the older IPv4. Both run at the same time on most networks today.
- Devices generally prefer IPv6 when it is available and fall back to IPv4 automatically if a connection fails.
- Some networks, routers, or VPNs handle IPv6 poorly, which can cause slow or failed connections, and disabling it becomes a workaround.
- Disabling IPv6 can break services or features that expect it, though this is still uncommon for typical browsing.
- Because the fallback usually works, most users notice no difference either way.
Is this normal?
Disabling IPv6 is a legitimate troubleshooting step. Leaving it enabled is the normal default state on modern devices and networks.
Does it cause any problems?
Sometimes. Services that use IPv6 may become unreachable or slightly slower, and some apps expect it to be present. For most people the impact is minor, but it is generally better left on unless it is causing a specific problem.
How to fix or check it
- On Windows, open Control Panel, Network and Sharing Center, Change adapter settings, right click your connection, choose Properties, and clear the box for Internet Protocol Version 6. Re-check it to enable again.
- On Mac, open System Settings, Network, select your connection, click Details, then TCP/IP, and adjust the Configure IPv6 option.
- On your router, look for an IPv6 toggle in the admin page if you want to change it network wide.
- On Android and iPhone there is usually no simple per device switch, since this is controlled by the carrier or network, so change it on the router instead.
- After any change, test your connection, and re-enable IPv6 if new problems appear.
Frequently asked questions
Will disabling IPv6 speed up my internet?
Rarely. It can help if IPv6 was misconfigured on your network, but in most cases you will not see a noticeable speed change.
Is it safe to disable IPv6?
Generally yes for now, since IPv4 still handles most traffic. Even so, it is better left on unless it is causing a specific issue.
Why does my VPN work better with IPv6 off?
Some VPNs do not fully support IPv6 and can leak traffic or fail to route it. Disabling IPv6 avoids that until the VPN supports it.