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Reposfatedier/frp
Views\"views\"
Stars\"stars\"
Forks\"forks\"
License\"license\"
UpdatedAt\"last-commit\"
CreatedAt\"create-at\"
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frp

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\"Build
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\n\"Go
\n\"GitHub

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README | 中文文档

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Sponsors

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frp is an open source project with its ongoing development made possible entirely by the support of our awesome sponsors. If you'd like to join them, please consider sponsoring frp's development.

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Gold Sponsors

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What is frp?

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frp is a fast reverse proxy that allows you to expose a local server located behind a NAT or firewall to the Internet. It currently supports TCP and UDP, as well as HTTP and HTTPS protocols, enabling requests to be forwarded to internal services via domain name.

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frp also offers a P2P connect mode.

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Table of Contents

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Development Status

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frp is currently under development. You can try the latest release version in the master branch, or use the dev branch to access the version currently in development.

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We are currently working on version 2 and attempting to perform some code refactoring and improvements. However, please note that it will not be compatible with version 1.

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We will transition from version 0 to version 1 at the appropriate time and will only accept bug fixes and improvements, rather than big feature requests.

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About V2

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The complexity and difficulty of the v2 version are much higher than anticipated. I can only work on its development during fragmented time periods, and the constant interruptions disrupt productivity significantly. Given this situation, we will continue to optimize and iterate on the current version until we have more free time to proceed with the major version overhaul.

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The concept behind v2 is based on my years of experience and reflection in the cloud-native domain, particularly in K8s and ServiceMesh. Its core is a modernized four-layer and seven-layer proxy, similar to envoy. This proxy itself is highly scalable, not only capable of implementing the functionality of intranet penetration but also applicable to various other domains. Building upon this highly scalable core, we aim to implement all the capabilities of frp v1 while also addressing the functionalities that were previously unachievable or difficult to implement in an elegant manner. Furthermore, we will maintain efficient development and iteration capabilities.

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In addition, I envision frp itself becoming a highly extensible system and platform, similar to how we can provide a range of extension capabilities based on K8s. In K8s, we can customize development according to enterprise needs, utilizing features such as CRD, controller mode, webhook, CSI, and CNI. In frp v1, we introduced the concept of server plugins, which implemented some basic extensibility. However, it relies on a simple HTTP protocol and requires users to start independent processes and manage them on their own. This approach is far from flexible and convenient, and real-world demands vary greatly. It is unrealistic to expect a non-profit open-source project maintained by a few individuals to meet everyone's needs.

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Finally, we acknowledge that the current design of modules such as configuration management, permission verification, certificate management, and API management is not modern enough. While we may carry out some optimizations in the v1 version, ensuring compatibility remains a challenging issue that requires a considerable amount of effort to address.

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We sincerely appreciate your support for frp.

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Architecture

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\"architecture\"

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Example Usage

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To begin, download the latest program for your operating system and architecture from the Release page.

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Next, place the frps binary and server configuration file on Server A, which has a public IP address.

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Finally, place the frpc binary and client configuration file on Server B, which is located on a LAN that cannot be directly accessed from the public internet.

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Some antiviruses improperly mark frpc as malware and delete it. This is due to frp being a networking tool capable of creating reverse proxies. Antiviruses sometimes flag reverse proxies due to their ability to bypass firewall port restrictions. If you are using antivirus, then you may need to whitelist/exclude frpc in your antivirus settings to avoid accidental quarantine/deletion. See issue 3637 for more details.

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Access your computer in a LAN network via SSH

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    \n
  1. Modify frps.toml on server A by setting the bindPort for frp clients to connect to:
    2. \n
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# frps.toml\nbindPort = 7000
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  1. Start frps on server A:
    2. \n
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./frps -c ./frps.toml

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    \n
  1. Modify frpc.toml on server B and set the serverAddr field to the public IP address of your frps server:
    2. \n
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# frpc.toml\nserverAddr = \"x.x.x.x\"\nserverPort = 7000\n\n[[proxies]]\nname = \"ssh\"\ntype = \"tcp\"\nlocalIP = \"127.0.0.1\"\nlocalPort = 22\nremotePort = 6000
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Note that the localPort (listened on the client) and remotePort (exposed on the server) are used for traffic going in and out of the frp system, while the serverPort is used for communication between frps and frpc.

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  1. Start frpc on server B:
    2. \n
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./frpc -c ./frpc.toml

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  1. To access server B from another machine through server A via SSH (assuming the username is test), use the following command:
    2. \n
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ssh -oPort=6000 test@x.x.x.x

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Multiple SSH services sharing the same port

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This example implements multiple SSH services exposed through the same port using a proxy of type tcpmux. Similarly, as long as the client supports the HTTP Connect proxy connection method, port reuse can be achieved in this way.

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    \n
  1. Deploy frps on a machine with a public IP and modify the frps.toml file. Here is a simplified configuration:
    2. \n
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bindPort = 7000\ntcpmuxHTTPConnectPort = 5002
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  1. Deploy frpc on the internal machine A with the following configuration:
    2. \n
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serverAddr = \"x.x.x.x\"\nserverPort = 7000\n\n[[proxies]]\nname = \"ssh1\"\ntype = \"tcpmux\"\nmultiplexer = \"httpconnect\"\ncustomDomains = [\"machine-a.example.com\"]\nlocalIP = \"127.0.0.1\"\nlocalPort = 22
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    \n
  1. Deploy another frpc on the internal machine B with the following configuration:
    2. \n
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serverAddr = \"x.x.x.x\"\nserverPort = 7000\n\n[[proxies]]\nname = \"ssh2\"\ntype = \"tcpmux\"\nmultiplexer = \"httpconnect\"\ncustomDomains = [\"machine-b.example.com\"]\nlocalIP = \"127.0.0.1\"\nlocalPort = 22
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  1. To access internal machine A using SSH ProxyCommand, assuming the username is \"test\":
    2. \n
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ssh -o 'proxycommand socat - PROXY:x.x.x.x:%h:%p,proxyport=5002' test@machine-a.example.com

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    \n
  1. To access internal machine B, the only difference is the domain name, assuming the username is \"test\":
    2. \n
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ssh -o 'proxycommand socat - PROXY:x.x.x.x:%h:%p,proxyport=5002' test@machine-b.example.com

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Accessing Internal Web Services with Custom Domains in LAN

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Sometimes we need to expose a local web service behind a NAT network to others for testing purposes with our own domain name.

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Unfortunately, we cannot resolve a domain name to a local IP. However, we can use frp to expose an HTTP(S) service.

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  1. Modify frps.toml and set the HTTP port for vhost to 8080:
    2. \n
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# frps.toml\nbindPort = 7000\nvhostHTTPPort = 8080
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If you want to configure an https proxy, you need to set up the vhostHTTPSPort.

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  1. Start frps:
    2. \n
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./frps -c ./frps.toml

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    \n
  1. Modify frpc.toml and set serverAddr to the IP address of the remote frps server. Specify the localPort of your web service:
    2. \n
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# frpc.toml\nserverAddr = \"x.x.x.x\"\nserverPort = 7000\n\n[[proxies]]\nname = \"web\"\ntype = \"http\"\nlocalPort = 80\ncustomDomains = [\"www.example.com\"]
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  1. Start frpc:
    2. \n
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./frpc -c ./frpc.toml

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    Map the A record of www.example.com to either the public IP of the remote frps server or a CNAME record pointing to your original domain.

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    2. \n
  2. \n

    Visit your local web service using url http://www.example.com:8080.

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    3. \n
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Forward DNS query requests

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  1. Modify frps.toml:
    2. \n
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# frps.toml\nbindPort = 7000
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  1. Start frps:
    2. \n
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./frps -c ./frps.toml

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    \n
  1. Modify frpc.toml and set serverAddr to the IP address of the remote frps server. Forward DNS query requests to the Google Public DNS server 8.8.8.8:53:
    2. \n
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# frpc.toml\nserverAddr = \"x.x.x.x\"\nserverPort = 7000\n\n[[proxies]]\nname = \"dns\"\ntype = \"udp\"\nlocalIP = \"8.8.8.8\"\nlocalPort = 53\nremotePort = 6000
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  1. Start frpc:
    2. \n
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./frpc -c ./frpc.toml

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  1. Test DNS resolution using the dig command:
    2. \n
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dig @x.x.x.x -p 6000 www.google.com

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Forward Unix Domain Socket

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Expose a Unix domain socket (e.g. the Docker daemon socket) as TCP.

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Configure frps as above.

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    \n
  1. Start frpc with the following configuration:
    2. \n
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# frpc.toml\nserverAddr = \"x.x.x.x\"\nserverPort = 7000\n\n[[proxies]]\nname = \"unix_domain_socket\"\ntype = \"tcp\"\nremotePort = 6000\n[proxies.plugin]\ntype = \"unix_domain_socket\"\nunixPath = \"/var/run/docker.sock\"
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  1. Test the configuration by getting the docker version using curl:
    2. \n
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curl http://x.x.x.x:6000/version

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Expose a simple HTTP file server

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Expose a simple HTTP file server to access files stored in the LAN from the public Internet.

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Configure frps as described above, then:

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    \n
  1. Start frpc with the following configuration:
    2. \n
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# frpc.toml\nserverAddr = \"x.x.x.x\"\nserverPort = 7000\n\n[[proxies]]\nname = \"test_static_file\"\ntype = \"tcp\"\nremotePort = 6000\n[proxies.plugin]\ntype = \"static_file\"\nlocalPath = \"/tmp/files\"\nstripPrefix = \"static\"\nhttpUser = \"abc\"\nhttpPassword = \"abc\"
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  1. Visit http://x.x.x.x:6000/static/ from your browser and specify correct username and password to view files in /tmp/files on the frpc machine.
    2. \n
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Enable HTTPS for a local HTTP(S) service

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You may substitute https2https for the plugin, and point the localAddr to a HTTPS endpoint.

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    \n
  1. Start frpc with the following configuration:
    2. \n
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# frpc.toml\nserverAddr = \"x.x.x.x\"\nserverPort = 7000\n\n[[proxies]]\nname = \"test_https2http\"\ntype = \"https\"\ncustomDomains = [\"test.example.com\"]\n\n[proxies.plugin]\ntype = \"https2http\"\nlocalAddr = \"127.0.0.1:80\"\ncrtPath = \"./server.crt\"\nkeyPath = \"./server.key\"\nhostHeaderRewrite = \"127.0.0.1\"\nrequestHeaders.set.x-from-where = \"frp\"
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  1. Visit https://test.example.com.
    2. \n
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Expose your service privately

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To mitigate risks associated with exposing certain services directly to the public network, STCP (Secret TCP) mode requires a preshared key to be used for access to the service from other clients.

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Configure frps same as above.

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  1. Start frpc on machine B with the following config. This example is for exposing the SSH service (port 22), and note the secretKey field for the preshared key, and that the remotePort field is removed here:
    2. \n
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# frpc.toml\nserverAddr = \"x.x.x.x\"\nserverPort = 7000\n\n[[proxies]]\nname = \"secret_ssh\"\ntype = \"stcp\"\nsecretKey = \"abcdefg\"\nlocalIP = \"127.0.0.1\"\nlocalPort = 22
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  1. Start another frpc (typically on another machine C) with the following config to access the SSH service with a security key (secretKey field):
    2. \n
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# frpc.toml\nserverAddr = \"x.x.x.x\"\nserverPort = 7000\n\n[[visitors]]\nname = \"secret_ssh_visitor\"\ntype = \"stcp\"\nserverName = \"secret_ssh\"\nsecretKey = \"abcdefg\"\nbindAddr = \"127.0.0.1\"\nbindPort = 6000
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  1. On machine C, connect to SSH on machine B, using this command:
    2. \n
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ssh -oPort=6000 127.0.0.1

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P2P Mode

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xtcp is designed to transmit large amounts of data directly between clients. A frps server is still needed, as P2P here only refers to the actual data transmission.

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Note that it may not work with all types of NAT devices. You might want to fallback to stcp if xtcp doesn't work.

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    \n
  1. Start frpc on machine B, and expose the SSH port. Note that the remotePort field is removed:
    2. \n
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# frpc.toml\nserverAddr = \"x.x.x.x\"\nserverPort = 7000\n# set up a new stun server if the default one is not available.\n# natHoleStunServer = \"xxx\"\n\n[[proxies]]\nname = \"p2p_ssh\"\ntype = \"xtcp\"\nsecretKey = \"abcdefg\"\nlocalIP = \"127.0.0.1\"\nlocalPort = 22
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    \n
  1. Start another frpc (typically on another machine C) with the configuration to connect to SSH using P2P mode:
    2. \n
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# frpc.toml\nserverAddr = \"x.x.x.x\"\nserverPort = 7000\n# set up a new stun server if the default one is not available.\n# natHoleStunServer = \"xxx\"\n\n[[visitors]]\nname = \"p2p_ssh_visitor\"\ntype = \"xtcp\"\nserverName = \"p2p_ssh\"\nsecretKey = \"abcdefg\"\nbindAddr = \"127.0.0.1\"\nbindPort = 6000\n# when automatic tunnel persistence is required, set it to true\nkeepTunnelOpen = false
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  1. On machine C, connect to SSH on machine B, using this command:
    2. \n
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ssh -oPort=6000 127.0.0.1

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Features

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Configuration Files

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Since v0.52.0, we support TOML, YAML, and JSON for configuration. Please note that INI is deprecated and will be removed in future releases. New features will only be available in TOML, YAML, or JSON. Users wanting these new features should switch their configuration format accordingly.

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Read the full example configuration files to find out even more features not described here.

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Examples use TOML format, but you can still use YAML or JSON.

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These configuration files is for reference only. Please do not use this configuration directly to run the program as it may have various issues.

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Full configuration file for frps (Server)

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Full configuration file for frpc (Client)

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Using Environment Variables

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Environment variables can be referenced in the configuration file, using Go's standard format:

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# frpc.toml\nserverAddr = \"{{ .Envs.FRP_SERVER_ADDR }}\"\nserverPort = 7000\n\n[[proxies]]\nname = \"ssh\"\ntype = \"tcp\"\nlocalIP = \"127.0.0.1\"\nlocalPort = 22\nremotePort = \"{{ .Envs.FRP_SSH_REMOTE_PORT }}\"
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With the config above, variables can be passed into frpc program like this:

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export FRP_SERVER_ADDR=x.x.x.x\nexport FRP_SSH_REMOTE_PORT=6000\n./frpc -c ./frpc.toml\n
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frpc will render configuration file template using OS environment variables. Remember to prefix your reference with .Envs.

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Split Configures Into Different Files

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You can split multiple proxy configs into different files and include them in the main file.

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# frpc.toml\nserverAddr = \"x.x.x.x\"\nserverPort = 7000\nincludes = [\"./confd/*.toml\"]
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# ./confd/test.toml\n\n[[proxies]]\nname = \"ssh\"\ntype = \"tcp\"\nlocalIP = \"127.0.0.1\"\nlocalPort = 22\nremotePort = 6000
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Server Dashboard

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Check frp's status and proxies' statistics information by Dashboard.

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Configure a port for dashboard to enable this feature:

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# The default value is 127.0.0.1. Change it to 0.0.0.0 when you want to access it from a public network.\nwebServer.addr = \"0.0.0.0\"\nwebServer.port = 7500\n# dashboard's username and password are both optional\nwebServer.user = \"admin\"\nwebServer.password = \"admin\"
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Then visit http://[serverAddr]:7500 to see the dashboard, with username and password both being admin.

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Additionally, you can use HTTPS port by using your domains wildcard or normal SSL certificate:

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webServer.port = 7500\n# dashboard's username and password are both optional\nwebServer.user = \"admin\"\nwebServer.password = \"admin\"\nwebServer.tls.certFile = \"server.crt\"\nwebServer.tls.keyFile = \"server.key\"
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Then visit https://[serverAddr]:7500 to see the dashboard in secure HTTPS connection, with username and password both being admin.

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\"dashboard\"

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Client Admin UI

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The Client Admin UI helps you check and manage frpc's configuration.

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Configure an address for admin UI to enable this feature:

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webServer.addr = \"127.0.0.1\"\nwebServer.port = 7400\nwebServer.user = \"admin\"\nwebServer.password = \"admin\"
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Then visit http://127.0.0.1:7400 to see admin UI, with username and password both being admin.

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Monitor

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When web server is enabled, frps will save monitor data in cache for 7 days. It will be cleared after process restart.

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Prometheus is also supported.

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Prometheus

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Enable dashboard first, then configure enablePrometheus = true in frps.toml.

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http://{dashboard_addr}/metrics will provide prometheus monitor data.

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Authenticating the Client

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There are 2 authentication methods to authenticate frpc with frps.

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You can decide which one to use by configuring auth.method in frpc.toml and frps.toml, the default one is token.

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Configuring auth.additionalScopes = [\"HeartBeats\"] will use the configured authentication method to add and validate authentication on every heartbeat between frpc and frps.

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Configuring auth.additionalScopes = [\"NewWorkConns\"] will do the same for every new work connection between frpc and frps.

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Token Authentication

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When specifying auth.method = \"token\" in frpc.toml and frps.toml - token based authentication will be used.

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Make sure to specify the same auth.token in frps.toml and frpc.toml for frpc to pass frps validation

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OIDC Authentication

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When specifying auth.method = \"oidc\" in frpc.toml and frps.toml - OIDC based authentication will be used.

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OIDC stands for OpenID Connect, and the flow used is called Client Credentials Grant.

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To use this authentication type - configure frpc.toml and frps.toml as follows:

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# frps.toml\nauth.method = \"oidc\"\nauth.oidc.issuer = \"https://example-oidc-issuer.com/\"\nauth.oidc.audience = \"https://oidc-audience.com/.default\"
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# frpc.toml\nauth.method = \"oidc\"\nauth.oidc.clientID = \"98692467-37de-409a-9fac-bb2585826f18\" # Replace with OIDC client ID\nauth.oidc.clientSecret = \"oidc_secret\"\nauth.oidc.audience = \"https://oidc-audience.com/.default\"\nauth.oidc.tokenEndpointURL = \"https://example-oidc-endpoint.com/oauth2/v2.0/token\"
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Encryption and Compression

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The features are off by default. You can turn on encryption and/or compression:

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# frpc.toml\n\n[[proxies]]\nname = \"ssh\"\ntype = \"tcp\"\nlocalPort = 22\nremotePort = 6000\ntransport.useEncryption = true\ntransport.useCompression = true
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TLS

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Since v0.50.0, the default value of transport.tls.enable and transport.tls.disableCustomTLSFirstByte has been changed to true, and tls is enabled by default.

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For port multiplexing, frp sends a first byte 0x17 to dial a TLS connection. This only takes effect when you set transport.tls.disableCustomTLSFirstByte to false.

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To enforce frps to only accept TLS connections - configure transport.tls.force = true in frps.toml. This is optional.

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frpc TLS settings:

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transport.tls.enable = true\ntransport.tls.certFile = \"certificate.crt\"\ntransport.tls.keyFile = \"certificate.key\"\ntransport.tls.trustedCaFile = \"ca.crt\"
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frps TLS settings:

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transport.tls.force = true\ntransport.tls.certFile = \"certificate.crt\"\ntransport.tls.keyFile = \"certificate.key\"\ntransport.tls.trustedCaFile = \"ca.crt\"
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You will need a root CA cert and at least one SSL/TLS certificate. It can be self-signed or regular (such as Let's Encrypt or another SSL/TLS certificate provider).

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If you using frp via IP address and not hostname, make sure to set the appropriate IP address in the Subject Alternative Name (SAN) area when generating SSL/TLS Certificates.

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Given an example:

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cat > my-openssl.cnf << EOF\n[ ca ]\ndefault_ca = CA_default\n[ CA_default ]\nx509_extensions = usr_cert\n[ req ]\ndefault_bits        = 2048\ndefault_md          = sha256\ndefault_keyfile     = privkey.pem\ndistinguished_name  = req_distinguished_name\nattributes          = req_attributes\nx509_extensions     = v3_ca\nstring_mask         = utf8only\n[ req_distinguished_name ]\n[ req_attributes ]\n[ usr_cert ]\nbasicConstraints       = CA:FALSE\nnsComment              = \"OpenSSL Generated Certificate\"\nsubjectKeyIdentifier   = hash\nauthorityKeyIdentifier = keyid,issuer\n[ v3_ca ]\nsubjectKeyIdentifier   = hash\nauthorityKeyIdentifier = keyid:always,issuer\nbasicConstraints       = CA:true\nEOF\n
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openssl genrsa -out ca.key 2048\nopenssl req -x509 -new -nodes -key ca.key -subj \"/CN=example.ca.com\" -days 5000 -out ca.crt\n
\n\n
openssl genrsa -out server.key 2048\n\nopenssl req -new -sha256 -key server.key \\\n    -subj \"/C=XX/ST=DEFAULT/L=DEFAULT/O=DEFAULT/CN=server.com\" \\\n    -reqexts SAN \\\n    -config <(cat my-openssl.cnf <(printf \"\\n[SAN]\\nsubjectAltName=DNS:localhost,IP:127.0.0.1,DNS:example.server.com\")) \\\n    -out server.csr\n\nopenssl x509 -req -days 365 -sha256 \\\n\t-in server.csr -CA ca.crt -CAkey ca.key -CAcreateserial \\\n\t-extfile <(printf \"subjectAltName=DNS:localhost,IP:127.0.0.1,DNS:example.server.com\") \\\n\t-out server.crt\n
\n\n
openssl genrsa -out client.key 2048\nopenssl req -new -sha256 -key client.key \\\n    -subj \"/C=XX/ST=DEFAULT/L=DEFAULT/O=DEFAULT/CN=client.com\" \\\n    -reqexts SAN \\\n    -config <(cat my-openssl.cnf <(printf \"\\n[SAN]\\nsubjectAltName=DNS:client.com,DNS:example.client.com\")) \\\n    -out client.csr\n\nopenssl x509 -req -days 365 -sha256 \\\n    -in client.csr -CA ca.crt -CAkey ca.key -CAcreateserial \\\n\t-extfile <(printf \"subjectAltName=DNS:client.com,DNS:example.client.com\") \\\n\t-out client.crt\n
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Hot-Reloading frpc configuration

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The webServer fields are required for enabling HTTP API:

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# frpc.toml\nwebServer.addr = \"127.0.0.1\"\nwebServer.port = 7400
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Then run command frpc reload -c ./frpc.toml and wait for about 10 seconds to let frpc create or update or remove proxies.

\n

Note that global client parameters won't be modified except 'start'.

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You can run command frpc verify -c ./frpc.toml before reloading to check if there are config errors.

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Get proxy status from client

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Use frpc status -c ./frpc.toml to get status of all proxies. The webServer fields are required for enabling HTTP API.

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Only allowing certain ports on the server

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allowPorts in frps.toml is used to avoid abuse of ports:

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# frps.toml\nallowPorts = [\n  { start = 2000, end = 3000 },\n  { single = 3001 },\n  { single = 3003 },\n  { start = 4000, end = 50000 }\n]
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Port Reuse

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vhostHTTPPort and vhostHTTPSPort in frps can use same port with bindPort. frps will detect the connection's protocol and handle it correspondingly.

\n

What you need to pay attention to is that if you want to configure vhostHTTPSPort and bindPort to the same port, you need to first set transport.tls.disableCustomTLSFirstByte to false.

\n

We would like to try to allow multiple proxies bind a same remote port with different protocols in the future.

\n

Bandwidth Limit

\n

For Each Proxy

\n
# frpc.toml\n\n[[proxies]]\nname = \"ssh\"\ntype = \"tcp\"\nlocalPort = 22\nremotePort = 6000\ntransport.bandwidthLimit = \"1MB\"
\n

Set transport.bandwidthLimit in each proxy's configure to enable this feature. Supported units are MB and KB.

\n

Set transport.bandwidthLimitMode to client or server to limit bandwidth on the client or server side. Default is client.

\n

TCP Stream Multiplexing

\n

frp supports tcp stream multiplexing since v0.10.0 like HTTP2 Multiplexing, in which case all logic connections to the same frpc are multiplexed into the same TCP connection.

\n

You can disable this feature by modify frps.toml and frpc.toml:

\n
# frps.toml and frpc.toml, must be same\ntransport.tcpMux = false
\n

Support KCP Protocol

\n

KCP is a fast and reliable protocol that can achieve the transmission effect of a reduction of the average latency by 30% to 40% and reduction of the maximum delay by a factor of three, at the cost of 10% to 20% more bandwidth wasted than TCP.

\n

KCP mode uses UDP as the underlying transport. Using KCP in frp:

\n
    \n
  1. Enable KCP in frps:
    2. \n
\n
# frps.toml\nbindPort = 7000\n# Specify a UDP port for KCP.\nkcpBindPort = 7000
\n

The kcpBindPort number can be the same number as bindPort, since bindPort field specifies a TCP port.

\n
    \n
  1. Configure frpc.toml to use KCP to connect to frps:
    2. \n
\n
# frpc.toml\nserverAddr = \"x.x.x.x\"\n# Same as the 'kcpBindPort' in frps.toml\nserverPort = 7000\ntransport.protocol = \"kcp\"
\n

Support QUIC Protocol

\n

QUIC is a new multiplexed transport built on top of UDP.

\n

Using QUIC in frp:

\n
    \n
  1. Enable QUIC in frps:
    2. \n
\n
# frps.toml\nbindPort = 7000\n# Specify a UDP port for QUIC.\nquicBindPort = 7000
\n

The quicBindPort number can be the same number as bindPort, since bindPort field specifies a TCP port.

\n
    \n
  1. Configure frpc.toml to use QUIC to connect to frps:
    2. \n
\n
# frpc.toml\nserverAddr = \"x.x.x.x\"\n# Same as the 'quicBindPort' in frps.toml\nserverPort = 7000\ntransport.protocol = \"quic\"
\n

Connection Pooling

\n

By default, frps creates a new frpc connection to the backend service upon a user request. With connection pooling, frps keeps a certain number of pre-established connections, reducing the time needed to establish a connection.

\n

This feature is suitable for a large number of short connections.

\n
    \n
  1. Configure the limit of pool count each proxy can use in frps.toml:
    2. \n
\n
# frps.toml\ntransport.maxPoolCount = 5
\n
    \n
  1. Enable and specify the number of connection pool:
    2. \n
\n
# frpc.toml\ntransport.poolCount = 1
\n

Load balancing

\n

Load balancing is supported by group.

\n

This feature is only available for types tcp, http, tcpmux now.

\n
# frpc.toml\n\n[[proxies]]\nname = \"test1\"\ntype = \"tcp\"\nlocalPort = 8080\nremotePort = 80\nloadBalancer.group = \"web\"\nloadBalancer.groupKey = \"123\"\n\n[[proxies]]\nname = \"test2\"\ntype = \"tcp\"\nlocalPort = 8081\nremotePort = 80\nloadBalancer.group = \"web\"\nloadBalancer.groupKey = \"123\"
\n

loadBalancer.groupKey is used for authentication.

\n

Connections to port 80 will be dispatched to proxies in the same group randomly.

\n

For type tcp, remotePort in the same group should be the same.

\n

For type http, customDomains, subdomain, locations should be the same.

\n

Service Health Check

\n

Health check feature can help you achieve high availability with load balancing.

\n

Add healthCheck.type = \"tcp\" or healthCheck.type = \"http\" to enable health check.

\n

With health check type tcp, the service port will be pinged (TCPing):

\n
# frpc.toml\n\n[[proxies]]\nname = \"test1\"\ntype = \"tcp\"\nlocalPort = 22\nremotePort = 6000\n# Enable TCP health check\nhealthCheck.type = \"tcp\"\n# TCPing timeout seconds\nhealthCheck.timeoutSeconds = 3\n# If health check failed 3 times in a row, the proxy will be removed from frps\nhealthCheck.maxFailed = 3\n# A health check every 10 seconds\nhealthCheck.intervalSeconds = 10
\n

With health check type http, an HTTP request will be sent to the service and an HTTP 2xx OK response is expected:

\n
# frpc.toml\n\n[[proxies]]\nname = \"web\"\ntype = \"http\"\nlocalIP = \"127.0.0.1\"\nlocalPort = 80\ncustomDomains = [\"test.example.com\"]\n# Enable HTTP health check\nhealthCheck.type = \"http\"\n# frpc will send a GET request to '/status'\n# and expect an HTTP 2xx OK response\nhealthCheck.path = \"/status\"\nhealthCheck.timeoutSeconds = 3\nhealthCheck.maxFailed = 3\nhealthCheck.intervalSeconds = 10
\n

Rewriting the HTTP Host Header

\n

By default frp does not modify the tunneled HTTP requests at all as it's a byte-for-byte copy.

\n

However, speaking of web servers and HTTP requests, your web server might rely on the Host HTTP header to determine the website to be accessed. frp can rewrite the Host header when forwarding the HTTP requests, with the hostHeaderRewrite field:

\n
# frpc.toml\n\n[[proxies]]\nname = \"web\"\ntype = \"http\"\nlocalPort = 80\ncustomDomains = [\"test.example.com\"]\nhostHeaderRewrite = \"dev.example.com\"
\n

The HTTP request will have the Host header rewritten to Host: dev.example.com when it reaches the actual web server, although the request from the browser probably has Host: test.example.com.

\n

Setting other HTTP Headers

\n

Similar to Host, You can override other HTTP request and response headers with proxy type http.

\n
# frpc.toml\n\n[[proxies]]\nname = \"web\"\ntype = \"http\"\nlocalPort = 80\ncustomDomains = [\"test.example.com\"]\nhostHeaderRewrite = \"dev.example.com\"\nrequestHeaders.set.x-from-where = \"frp\"\nresponseHeaders.set.foo = \"bar\"
\n

In this example, it will set header x-from-where: frp in the HTTP request and foo: bar in the HTTP response.

\n

Get Real IP

\n

HTTP X-Forwarded-For

\n

This feature is for http proxies or proxies with the https2http and https2https plugins enabled.

\n

You can get user's real IP from HTTP request headers X-Forwarded-For.

\n

Proxy Protocol

\n

frp supports Proxy Protocol to send user's real IP to local services. It support all types except UDP.

\n

Here is an example for https service:

\n
# frpc.toml\n\n[[proxies]]\nname = \"web\"\ntype = \"https\"\nlocalPort = 443\ncustomDomains = [\"test.example.com\"]\n\n# now v1 and v2 are supported\ntransport.proxyProtocolVersion = \"v2\"
\n

You can enable Proxy Protocol support in nginx to expose user's real IP in HTTP header X-Real-IP, and then read X-Real-IP header in your web service for the real IP.

\n

Require HTTP Basic Auth (Password) for Web Services

\n

Anyone who can guess your tunnel URL can access your local web server unless you protect it with a password.

\n

This enforces HTTP Basic Auth on all requests with the username and password specified in frpc's configure file.

\n

It can only be enabled when proxy type is http.

\n
# frpc.toml\n\n[[proxies]]\nname = \"web\"\ntype = \"http\"\nlocalPort = 80\ncustomDomains = [\"test.example.com\"]\nhttpUser = \"abc\"\nhttpPassword = \"abc\"
\n

Visit http://test.example.com in the browser and now you are prompted to enter the username and password.

\n

Custom Subdomain Names

\n

It is convenient to use subdomain configure for http and https types when many people share one frps server.

\n
# frps.toml\nsubDomainHost = \"frps.com\"
\n

Resolve *.frps.com to the frps server's IP. This is usually called a Wildcard DNS record.

\n
# frpc.toml\n\n[[proxies]]\nname = \"web\"\ntype = \"http\"\nlocalPort = 80\nsubdomain = \"test\"
\n

Now you can visit your web service on test.frps.com.

\n

Note that if subdomainHost is not empty, customDomains should not be the subdomain of subdomainHost.

\n

URL Routing

\n

frp supports forwarding HTTP requests to different backend web services by url routing.

\n

locations specifies the prefix of URL used for routing. frps first searches for the most specific prefix location given by literal strings regardless of the listed order.

\n
# frpc.toml\n\n[[proxies]]\nname = \"web01\"\ntype = \"http\"\nlocalPort = 80\ncustomDomains = [\"web.example.com\"]\nlocations = [\"/\"]\n\n[[proxies]]\nname = \"web02\"\ntype = \"http\"\nlocalPort = 81\ncustomDomains = [\"web.example.com\"]\nlocations = [\"/news\", \"/about\"]
\n

HTTP requests with URL prefix /news or /about will be forwarded to web02 and other requests to web01.

\n

TCP Port Multiplexing

\n

frp supports receiving TCP sockets directed to different proxies on a single port on frps, similar to vhostHTTPPort and vhostHTTPSPort.

\n

The only supported TCP port multiplexing method available at the moment is httpconnect - HTTP CONNECT tunnel.

\n

When setting tcpmuxHTTPConnectPort to anything other than 0 in frps, frps will listen on this port for HTTP CONNECT requests.

\n

The host of the HTTP CONNECT request will be used to match the proxy in frps. Proxy hosts can be configured in frpc by configuring customDomains and / or subdomain under tcpmux proxies, when multiplexer = \"httpconnect\".

\n

For example:

\n
# frps.toml\nbindPort = 7000\ntcpmuxHTTPConnectPort = 1337
\n
# frpc.toml\nserverAddr = \"x.x.x.x\"\nserverPort = 7000\n\n[[proxies]]\nname = \"proxy1\"\ntype = \"tcpmux\"\nmultiplexer = \"httpconnect\"\ncustomDomains = [\"test1\"]\nlocalPort = 80\n\n[[proxies]]\nname = \"proxy2\"\ntype = \"tcpmux\"\nmultiplexer = \"httpconnect\"\ncustomDomains = [\"test2\"]\nlocalPort = 8080
\n

In the above configuration - frps can be contacted on port 1337 with a HTTP CONNECT header such as:

\n
CONNECT test1 HTTP/1.1\\r\\n\\r\\n\n
\n

and the connection will be routed to proxy1.

\n

Connecting to frps via PROXY

\n

frpc can connect to frps through proxy if you set OS environment variable HTTP_PROXY, or if transport.proxyURL is set in frpc.toml file.

\n

It only works when protocol is tcp.

\n
# frpc.toml\nserverAddr = \"x.x.x.x\"\nserverPort = 7000\ntransport.proxyURL = \"http://user:pwd@192.168.1.128:8080\"
\n

Port range mapping

\n

Added in v0.56.0

\n

We can use the range syntax of Go template combined with the built-in parseNumberRangePair function to achieve port range mapping.

\n

The following example, when run, will create 8 proxies named test-6000, test-6001 ... test-6007, each mapping the remote port to the local port.

\n
{{- range $_, $v := parseNumberRangePair \"6000-6006,6007\" \"6000-6006,6007\" }}\n[[proxies]]\nname = \"tcp-{{ $v.First }}\"\ntype = \"tcp\"\nlocalPort = {{ $v.First }}\nremotePort = {{ $v.Second }}\n{{- end }}\n
\n

Client Plugins

\n

frpc only forwards requests to local TCP or UDP ports by default.

\n

Plugins are used for providing rich features. There are built-in plugins such as unix_domain_socket, http_proxy, socks5, static_file, http2https, https2http, https2https and you can see example usage.

\n

Using plugin http_proxy:

\n
# frpc.toml\n\n[[proxies]]\nname = \"http_proxy\"\ntype = \"tcp\"\nremotePort = 6000\n[proxies.plugin]\ntype = \"http_proxy\"\nhttpUser = \"abc\"\nhttpPassword = \"abc\"
\n

httpUser and httpPassword are configuration parameters used in http_proxy plugin.

\n

Server Manage Plugins

\n

Read the document.

\n

Find more plugins in gofrp/plugin.

\n

SSH Tunnel Gateway

\n

added in v0.53.0

\n

frp supports listening to an SSH port on the frps side and achieves TCP protocol proxying through the SSH -R protocol, without relying on frpc.

\n
# frps.toml\nsshTunnelGateway.bindPort = 2200
\n

When running ./frps -c frps.toml, a private key file named .autogen_ssh_key will be automatically created in the current working directory. This generated private key file will be used by the SSH server in frps.

\n

Executing the command

\n
ssh -R :80:127.0.0.1:8080 v0@{frp address} -p 2200 tcp --proxy_name \"test-tcp\" --remote_port 9090
\n

sets up a proxy on frps that forwards the local 8080 service to the port 9090.

\n
frp (via SSH) (Ctrl+C to quit)\n\nUser:\nProxyName: test-tcp\nType: tcp\nRemoteAddress: :9090
\n

This is equivalent to:

\n
frpc tcp --proxy_name \"test-tcp\" --local_ip 127.0.0.1 --local_port 8080 --remote_port 9090
\n

Please refer to this document for more information.

\n

Virtual Network (VirtualNet)

\n

Alpha feature added in v0.62.0

\n

The VirtualNet feature enables frp to create and manage virtual network connections between clients and visitors through a TUN interface. This allows for IP-level routing between machines, extending frp beyond simple port forwarding to support full network connectivity.

\n

For detailed information about configuration and usage, please refer to the VirtualNet documentation.

\n

Feature Gates

\n

frp supports feature gates to enable or disable experimental features. This allows users to try out new features before they're considered stable.

\n

Available Feature Gates

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
NameStageDefaultDescription
VirtualNetALPHAfalseVirtual network capabilities for frp
\n

Enabling Feature Gates

\n

To enable an experimental feature, add the feature gate to your configuration:

\n
featureGates = { VirtualNet = true }
\n

Feature Lifecycle

\n

Features typically go through three stages:

\n
    \n
  1. ALPHA: Disabled by default, may be unstable
    2. \n
  2. BETA: May be enabled by default, more stable but still evolving
    3. \n
  3. GA (Generally Available): Enabled by default, ready for production use
    4. \n
\n

Related Projects

\n\n

Contributing

\n

Interested in getting involved? We would like to help you!

\n\n

Note: We prefer you to give your advise in issues, so others with a same question can search it quickly and we don't need to answer them repeatedly.

\n

Donation

\n

If frp helps you a lot, you can support us by:

\n

GitHub Sponsors

\n

Support us by Github Sponsors.

\n

You can have your company's logo placed on README file of this project.

\n

PayPal

\n

Donate money by PayPal to my account fatedier@gmail.com.

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