Linux network settings

Linux network settings-general Linux technology-Linux technology and application information. For more information, see the following section. About network settings: in the dormitory, we can only use telephone lines to access the Internet. We use the telecommunications Tianyi packet traffic service and telephone lines to connect to the Gateway (it is said that it is the connection between the modem and the router ), then, use the wireless network card of the computer for wireless Internet access. Currently, the computer can access the Internet under the window, but it cannot be used in linux. Which of the following experiences has been similar? How can I set up to access the Internet? Please help me. I am using centos5.4. Thank you.