Your SSH client will tell the server to forward a specific port-say, port 1234-on the SSH server to a specific address and port on your current PC or local network. In that case, your command would look like this:Īssuming you can access a remote SSH server, you can connect to that SSH server and use remote port forwarding. You have access to the office's SSH server at, and your user account on the SSH server is bob. Ssh -L local_port:remote_address:remote_port example, let's say the database server at your office is located at 192.168.1.111 on the office network. To use local forwarding, connect to the SSH server normally, but also supply the -L You can use any command line or graphical tool to access the database server as if it was running on your local PC. The SSH server sits in the middle, forwarding traffic back and forth. So, when you attempt to access the database server at port 1234 your current PC, "localhost", that traffic is automatically "tunneled" over the SSH connection and sent to the database server. To do this, you establish an SSH connection with the SSH server and tell the client to forward traffic from a specific port from your local PC-for example, port 1234-to the address of the database's server and its port on the office network. This is often the case, as it's easier to secure a single SSH server against attacks than to secure a variety of different network resources. But if you have access to an SSH server at the office, and that SSH server allows connections from outside the office network, then you can connect to that SSH server from home and access the database server as if you were in the office. For security reasons, that database server is only configured to accept connections from the local office network. For example, let's say you want to access a database server at your office from your home. "Local port forwarding" allows you to access local network resources that aren't exposed to the Internet. Local Port Forwarding: Make Remote Resources Accessible on Your Local System On Windows, which doesn't include a built-in ssh command, we recommend the free tool PuTTY to connect to SSH servers. You can do this with the ssh command included on Linux, macOS, and other UNIX-like operating systems, and you can create an ssh config file to save your settings. The traffic is sent over the encrypted SSH connection, so it can't be monitored or modified in transit. Each involves using an SSH server to redirect traffic from one network port to another. There are three different types of SSH tunneling, and they're all used for different purposes.
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