I'm using new Xfinity Modem.
I have change my local IP addresses to the range of 172.16.0.2 to 172.16.0.253, ( 172.16.0.1 using for Admin access).
the Modem was working fine, then after a one month suddenly the IP changed to 10.0.0.0 range ! I tried to change it back but the Modem hanged up and when I restart it again back to 10.0.0.0 range. I cannot even change it via xFi.
I really want to know the reason! it's weird.