1/12/2023 0 Comments Permanent ssh tunnelIn this screenshot, you can see that there are 3 SSH tunnels established. You can see what SSH tunnels are currently established with the lsof command. The command syntax is like this: $ ssh -R remote_port1:local_ip:local_port1 remote_port2:local_ip:local_port2 port forwarding The command syntax is like this: $ ssh -L local_port_1:remote_ip:remote_port_1 -L local_port_2:remote_ip:remote_port2 example, if you want to forward ports 80 to 192.168.1.1 ports 80 and 443 (HTTP and HTTPS), respectively, you would use this command: $ ssh -L 8080:192.168.1.1:80 -L 4430:192.168.1.1:443 remote port forwarding, you can set up more than one port to be forwarded by specifying each new rule with the -R switch. Multiple forwardingįor local port forwarding, if youd like to set up more than one port to be forwarded to a remote host, you just need to specify each rule with a new -L switch each time. Type the loopback address (127.0.0.1) and the port you configured for dynamic port forwarding, and all traffic will be forwarded through the SSH tunnel to the remote host (in our example, the SSH server). To set up dynamic port forwarding, use the ssh command with the following syntax: $ ssh -D local_port if we wanted to forward traffic on port 1234 to our SSH server: $ ssh -D 1234 youve established this connection, you can configure applications to route traffic through it. It also provides privacy, since you can route your traffic through a SOCKS server with dynamic port forwarding and prevent anyone from snooping log files to see your network traffic (websites visited, etc.). If you have ever used a proxy server to visit a blocked website or view location-restricted content (like viewing stuff on Netflix that isnt available in your country), you probably used a SOCKS server. Rather than forwarding traffic on a specific port (the way local and remote port forwarding do), this will forward traffic across a range of ports. SSH dynamic port forwarding will make SSH act as a SOCKS proxy server. We cover the details later in the tutorial. Youll need an extra program for this called sshuttle. You can use SSH port forwarding to set up a virtual private network (VPN). The most common use for this is for private web browsing or to make your connection seemingly originate from a different country or location. You can configure applications to connect to the proxy and transmit all data through it. An SSH tunnel is established, but the remote system is able to access your local network.ĭynamic port forwarding sets up a SOCKS proxy server. Remote port forwarding is the exact opposite. An SSH tunnel is established to a remote system, and traffic from the local network can use that tunnel to transmit data back and forth, accessing the remote system and network as if it was a part of the local network. Local port forwarding is used to make an external resource available on the local network. Each configuration requires its own steps to set up, so we will go over each of them later in the tutorial. There are a few different things you can do with this: local forwarding, remote forwarding, and dynamic port forwarding. To put it simply, SSH port forwarding involves establishing an SSH tunnel between two or more systems and then configuring the systems to transmit a specified type of traffic through that connection.
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