After checking the Huawei B525 datasheet, I found the Huawei B525 LTE has a DHCP server which enables users to enables and disable the DHCP server. or configure DHCP server address pools. You could do the settings by logon the WEBGUI via http://192.168.8.1. If there is nothing, it may because your router is a customized version with which the function is disabled, you could have a check with your carrier.