The Huawei E8372H-608 IP address ( is of the same subnet as the Billion 8700 & 8900 series router default IP
You must make sure the Billion router IP address is not in conflict with the  Huawei E8372H-608; if IP address conflict occurs, it causes the Internet not to work.
You have the option to change the default gateway IP on the Billion router or the Huawei E8372H-608.