By the end of 2011, Internet Protocol version 4 (IPv4) addresses were replaced by the next generation Internet Protocol version 6 (IPv6). Setting up your computer to prefer IPv4 over IPv6 enables your computer to function in a native IPv4 network without dual-stack.
NOTE: Dual-stack means that devices on the network are able to run IPv4 and IPv6 in parallel. It allows hosts to simultaneously reach IPv4 and IPv6 content, so it offers a very flexible coexistence of both. For information about dual-stack implementation, click here.
To revert back to IPv4 from IPv6 on your Linksys Smart Wi-Fi Router follow the steps below.
Access your Linksys cloud account. For instructions, click here.
Under Connectivity, click the Internet Settings tab.
NOTE: IPv6 is enabled by default.
Click IPv6 then uncheck the Enabled box beside IPv6 – Automatic.
Click the button.
You should now have successfully reverted the Linksys Smart Wi-Fi Router from IPv6 to IPv4.