Just wanted to report a bug I ran into the other day with my ISP and Asus RT-AC68U router. They changed my WAN DHCP address to a non standard (in my opinion) set of IP's an the Router refused to accept it.
Example:
IP: 123.222.233.87
Subnet: 255.255.252.0
Gateway: 123.222.232.1
Generally the third octet of the gateway matches the third octet of the IP address. In my case the ISP changed it the other day and now it doesn't match. For some reason this seems to make the RT-AC68U give an error that the DHCP from the ISP isn't working correctly. After some troubleshooting I found I can statically assign the router the DHCP IP from the ISP and it'll work (until they change it again). Wasn't sure if this had been reported before.
Example:
IP: 123.222.233.87
Subnet: 255.255.252.0
Gateway: 123.222.232.1
Generally the third octet of the gateway matches the third octet of the IP address. In my case the ISP changed it the other day and now it doesn't match. For some reason this seems to make the RT-AC68U give an error that the DHCP from the ISP isn't working correctly. After some troubleshooting I found I can statically assign the router the DHCP IP from the ISP and it'll work (until they change it again). Wasn't sure if this had been reported before.