Multiple SSH Services Sharing the Same Port

Steps

1. Deploy frps on a machine with public IP

   Modify the frps.toml file to include the following content (using the most simplified configuration here):

   bindPort = 7000
   tcpmuxHTTPConnectPort = 5002
   

2. Deploy frpc on intranet machine A

   Create an frpc configuration file, for example frpc.toml, and add the following content to the configuration file:

   serverAddr = "x.x.x.x"
   serverPort = 7000
   
   [[proxies]]
   name = "ssh1"
   type = "tcpmux"
   multiplexer = "httpconnect"
   customDomains = ["machine-a.example.com"]
   localIP = "127.0.0.1"
   localPort = 22
   

3. Deploy another frpc on intranet machine B

   Create an frpc configuration file, for example frpc.toml, and add the following content to the configuration file:

   serverAddr = "x.x.x.x"
   serverPort = 7000
   
   [[proxies]]
   name = "ssh2"
   type = "tcpmux"
   multiplexer = "httpconnect"
   customDomains = ["machine-b.example.com"]
   localIP = "127.0.0.1"
   localPort = 22
   

4. Access intranet machine A via SSH ProxyCommand

   Use SSH ProxyCommand to access intranet machine A, assuming the username is test. Use the following command:

   ssh -o 'proxycommand socat - PROXY:x.x.x.x:%h:%p,proxyport=5002' test@machine-a.example.com
   

   To access intranet machine B, simply change the domain name, assuming the username is still test:

   ssh -o 'proxycommand socat - PROXY:x.x.x.x:%h:%p,proxyport=5002' test@machine-b.example.com
   

By following the above steps, you can implement multiple SSH services sharing the same port for access on machines with public IP addresses.