The encryption ends at the OpenSSH server endpoint where traffic travels on the internal subnet. It is important to note that despite connecting to a insecure (non-SSL/TLS) MongoDB port locally, the traffic is encrypted over the public Internet by SSH. The mongo command assumes the host is localhost and port is 27017 unless otherwise specified. MongoDB can now be accessed from another shell terminal on the local workstation: mongo She begins by establishing an SSH connection from her local workstation to the OpenSSH server: ssh -L 27017:10.11.50.10:27017 traffic to localhost (127.0.0.1) on port 27017 is forwarded through the OpenSSH server and onto the internal MongoDB server. In this situation, Gwen can forward traffic to the internal MongoDB instance through the OpenSSH server. There is no VPN available, but there is another host () accessible over SSH on the same internal network as the MongoDB server. Gwen is working remotely, but needs to access a MongoDB instance running on an internal host (10.11.50.10) at her cloud provider. The OpenSSH server continues to forward the traffic onto a specified destination IP address and port provided by the OpenSSH client. The OpenSSH client forwards the traffic onto a remote OpenSSH server over a secure connection. This port can be bound to any IP address on the local machine, but will usually be the loopback address, 127.0.0.1. Local port forwarding allows traffic to be sent to a new port established by the OpenSSH client on a local machine. This is usually acceptable if the OpenSSH server and destination are on the same private subnet. The traffic will return to its original, potentially unencrypted, state after the OpenSSH server and onto the destination. Network Traffic Encryption: Traffic between the OpenSSH client and the OpenSSH server will be encrypted even if the forwarded protocol (e.g.To use these privileged ports, the OpenSSH client must be run with root privileges (using sudo, for example). Ports under 1024 are considered privileged ports and can only be created by the root user. Privileged Ports: A local port of 1024 or higher must be used.Internal firewall rules and routing must allow the OpenSSH server unrestricted access to the destination service. Firewalls Rules: The destination services to which the connection is established must be accessible to the OpenSSH server.SSH port forwarding is extremely convenient and flexible however, there are a few items to keep in mind. Also, the traffic between the OpenSSH client and the OpenSSH server is encrypted by the SSH protocol. With both of these features, network traffic originating from a host appears to originate from the remote OpenSSH server instead. These features can be extremely useful when working over insecure networks or around restrictive firewalls. In addition to providing a secure shell on a remote server, OpenSSH allows port forwarding and can be used as a SOCKS-compliant proxy.
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