I have tried configuring a Ipv6 subnet address 2001:0dce:0000:0000::1/53 into the router interface.
It works but when the I tried setting the auto-configuration button on the PC connected to this interface, it does not work. However, if I put the Ipv6 address as 2001:0dce:0000:0000::1/64, it works instead. But for my project, it requires a /53 prefix length. How can I fix this?