2021年9月16日 · - **VPDN（Virtual Private Dial-up Network，虚拟专用拨号网络）**：用于实现远程用户通过公共网络（如互联网）访问企业内部网络的安全连接。 - **PPPoE（Point-to-Point Protocol over Ethernet，以太网上的点对点...

In computer networking, Point-to-Point Protocol (PPP) is a data link layer (layer 2) communication protocol between two routers directly without any host or any other networking in between. [1] It can provide loop detection, authentication, transmission encryption, [2] and data compression.

Dial-up PPP Overview. The most commonly used PPP configuration is the dial-up link. In a dial-up link, the local peer dials up the remote peer to establish the connection and run PPP. In the dial-up process, the local peer calls the remote peer's telephone number to initiate the link.

2024年2月19日 · Point-to-Point Protocol (PPP) is a data link layer (Layer 2 in the OSI model) communication protocol used to establish a direct connection between two nodes. It can operate over several types of physical networks, including serial cable, phone line, trunk line, cellular telephone, specialized radio links, and fiber optic links.

Press and hold the PWKKEY button on the SIM7600CE 4G HAT to turn on the SIM7600CE 4G HAT. After it is turned on normally, the NET indicator should flash (if it is not flashing, please check whether the SIM card is available, or whether it has entered the airplane mode).

2023年9月13日 · This page covers the process of setting up a Linux system with an attached modem as a dial-in server using the point to point protocol (PPP), so that other computers can dial up to it and access connected networks.

In order to communicate over TCP/IP using a modem (such as through a dial-up account to an Internet service provider) or through some other serial device (such as a "null modem" serial cable between two machines), Linux provides the Point-to …

The following chapters describe the two methods to set the PPP dial-up parameters: using the command-line interface (CLI) to transmit parameters and using the script to set parameters.

PPP facilitates the transmission of data packets between point to point links. Originally designed to work with serial connections, PPP was adopted by ISPs to provide dial-up Internet access. PPP can be encapsulated in a number of data link layer protocols, including Ethernet (PPPoE) and Asynchronous Transfer Mode (PPPoA).

Today most ISP's offer PPP for serial (telephone) line internet access. The former internet standards SLIP and its compressed cousin CSLIP were used before PPP, but are obsolete now. PPP can run directly over a serial line (dial-up or directly-connected asynchronous lines and synchronous lines such as T1/E1 lines).