Huawei B612 - Ethernet Internet Access; Accessing Internet via Ethernet Port

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3. Accessing the Internet through an Ethernet port
You can connect the router to a wall-mounted Ethernet port using an
Ethernet cable to connect to the Internet when you have used up your
data allowance.
Configure the relevant settings on the web-based management page
before connecting to the Internet through an Ethernet port. More
information can be found in the help section of the web-based
management page.