Ssh uses port forwarding to implement SOCKS5 proxy

Currently, openssh is widely used in linux.

Ssh-related options:

• -V
  Show version:
  Ssh-V
OpenSSH_6.6.1p1 Ubuntu-2ubuntu2, OpenSSL 1.0.1f 6 Jan 2014

• -F
  Enter the password and enter the background mode (Requests ssh to go to background just before command execution .)

• -N
  Do not execute a remote command. This is useful for just for warding ports (protocol version 2 only ).)

• -D
  Socket5 proxy (Specifies a local "dynamic" application-level port forwarding. Currently the SOCKS4 and SOCKS5 protocols are supported, and ssh will act as a SOCKS server .)

• -L
  Tcp forwarding (Specifies that the given port on the local (client) host is to be forwarded to the given host and port on the remote side .)

• -C
  Compression is desirable on modem lines and other slow connections, but will only slow down things on fast networks. the compression algorithm is the same used by gzip)

Create a SOCKS5 proxy:

Ssh-f-N-D bindaddress: port name @ server

• Bindaddress: specify the bound IP address.
• Port: specifies the listening port.
• Name: ssh server login name
• Server: ssh server address

Example:
Ssh-f-N-D 127.0.0.1: 1080 [email protected]
In this way, the SOCKS5 proxy is created.

Use SOCKS5 proxy

Example:

• Chrome:
  Chrome needs to use the command to specify the SOCKS5 proxy:
  Google-chrome -- proxy-server = "socks: // 127.0.0.1: 1080"

• Firefox:
  In preferences => advanced => Network-> connection-> Settings, check Manual proxy configuration and clear other items. Set SOCKS Host to 127.0.0.1 and port to 1080, check Remote DNS (to prevent local DNS contamination ),.
  

• Others, please search for specific articles about their respective configurations:

• Use proxy plug-ins such as switchysharp

• Set the global proxy in the agent that comes with the system

• Use other SOCKS clients to implement proxy, such as redsocks

Reference

• SSH tunneling and port forwarding and intranet penetration
• OpenSSH official website

Ssh uses port forwarding to implement SOCKS5 proxy