概念

了解以下概念有助于更好地理解和使用 frp。

工作原理

frp 主要由两个组件组成：客户端(frpc) 和服务端(frps)。通常情况下，服务端部署在具有公网 IP 地址的机器上，而客户端部署在需要穿透的内网服务所在的机器上。

由于内网服务缺乏公网 IP 地址，因此无法直接被非局域网内的用户访问。用户通过访问服务端的 frps，frp 负责根据请求的端口或其他信息将请求路由到相应的内网机器，从而实现通信。

代理

在 frp 中，一个代理对应一个需要公开访问的内网服务。一个客户端可以同时配置多个代理，以满足不同的需求。

代理类型

frp 支持多种代理类型，以适应不同的使用场景。以下是一些常见的代理类型：

TCP：提供纯粹的 TCP 端口映射，使服务端能够根据不同的端口将请求路由到不同的内网服务。
UDP：提供纯粹的 UDP 端口映射，与 TCP 代理类似，但用于 UDP 流量。
HTTP：专为 HTTP 应用设计，支持修改 Host Header 和增加鉴权等额外功能。
HTTPS：类似于 HTTP 代理，但专门用于处理 HTTPS 流量。
STCP：提供安全的 TCP 内网代理，要求在被访问者和访问者的机器上都部署 frpc，不需要在服务端暴露端口。
SUDP：提供安全的 UDP 内网代理，与 STCP 类似，需要在被访问者和访问者的机器上都部署 frpc，不需要在服务端暴露端口。
XTCP：点对点内网穿透代理，与 STCP 类似，但流量不需要经过服务器中转。
TCPMUX：支持服务端 TCP 端口的多路复用，允许通过同一端口访问不同的内网服务。

每种代理类型适用于不同的使用情境，您可以根据需求选择合适的代理类型来配置 frp。

最后修改 November 15, 2023: fix 404 (#71) (626ce4d)

Concept

Understanding the following Concepts helps to better understand and use frp.

Working principle

Frp mainly consists of two components: Client (frpc) and Server side (frps). Normally, Server side deployment is done with a public IP address The client is deployed on the machine where the internal network service that needs to be penetrated is located.

Due to the lack of public IP for internal network services The address cannot be directly accessed by users outside the local area network. Users access the server by Side FRPS, FRP Responsible for routing requests to the corresponding intranet machines based on the requested port or other information, in order to achieve communication.

Agent

In frp, an Agent Corresponding to an intranet service that requires public access. A client can simultaneously configure multiple agents To meet different needs.

Agent types of

FRP supports multiple agents Type to adapt to different Use scenarios. The following are some common types of agents:

TCP: Provides pure TCP port mapping to enable Server side Can route requests to different internal network services based on different ports.
UDP: Provides pure UDP port mapping, compatible with TCP Agent Similar, but used for UDP traffic.
HTTP: Specially designed for HTTP applications, supports modifying Host Additional features such as header and added authentication.
HTTPS: Similar to HTTP Agent, but specifically used for handling HTTPS traffic.
STCP: Provides a secure TCP intranet agent , requiring deployment on both the machine being visited and the machine being visited FRPC, there is no need to expose ports on the server side.
SUDP: Provides a secure UDP intranet agent, compatible with STCP Similarly, it needs to be deployed on both the machine being visited and the machine being visited FRPC, there is no need to expose ports on the server side.
XTCP: Point to point intranet PenetrationAgent, with STCP Similar, but the traffic does not need to go through the server intermediary.
TCPMUX: Supports Server side TCP Port multiplexing allows access to different intranet services through the same port.

Each Agent The type is suitable for different Use scenarios, and you can choose the appropriate Agent according to your needs Type to Configuration frp.

Last modified November 15, 2023: fix 404 (#71) (626ce4d)