There's two kinds of SOCKS protocols - SOCKS4 and SOCKS5. This makes SSH acts as a SOCKS proxy server. This port forwarding is created using a -D parameter. g allows remote hosts to connect to local forwarded ports and this will make loopback port 3000 on the server accessible on all interfaces on port 9000.ĭynamic port forwarding allows communication across a range of ports. Then we tell SSH to make a tunnel that opens up a new port on server, and you connect to it via local port on your machine. In such a scenario, you can setup a server on internet which is publicly accessible and has SSH access. While this problem can be solved by configuring NAT (Network Address Translation) on your router - this might not always work, there's a technical overhead of changing the configuration of your router, and you would need the admin access on your network. In most cases, the ISP doesn't provide you with a public IP address, so you cannot connect your machine directly via the internet. Say you're developing an application on your local machine and you'd like to show the prototype to your boss. Forwarding can also be done using Unix sockets. This translates to - connect with ssh to connectToHost, and forward all connection attempts to the remote sourcePort to port destPort on the machine called forwardToHost, which can be reached from the connectToHost machine. Going back to the man-page again to see the definition of remote If not, check AllowTcpForwarding in /etc/ssh/sshd_config. If you're using port forwarding of any kind, you need to specifiy the destination server, i.e. Port numbers less than 1024 or greater than 49151 are reserved for the system, and can only be forwarded by root. In other words - forward my local port 9000 to port 5432 on the server - because when you're on the server, localhost means server itself. In the example of database connection, 9000:localhost:5432 means localhost from server's perspective, not localhost on your machine. So SSH on your server actually makes a tunnel (connection) between those two ports - one of which lies on your local machine, and another on target machine. In the YouTube example, 9000::80 says - forward my local port 9000 to at port 80. Let's take a moment here and understand what is actually going on. Enter fullscreen mode Exit fullscreen mode
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