The Xiaomi Router BE3600 has IPv6 enabled by default. When the IPv6 option is turned on, you will not notice any significant changes. It is checked by default during the router’s initial configuration.
For your reference, here’s more information about the IPv6:
1. IPv6 (Internet Protocol version 6) is the most recent version of the Internet Protocol (IP), which is used to identify and locate devices on networks and route traffic across the Internet;
2. It was developed to address the limitations of the previous version, IPv4, primarily the shortage of available IP addresses due to the growing number of devices connected to the Internet;
3. IPv6 uses 128-bit addresses, which allows for approximately 340 undecillion (3.4 × 10^38) unique IP addresses. This is a vast increase compared to IPv4's 32-bit addressing, which only supports about 4.3 billion addresses.