Forward port

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To connect to a service on a remote server that does not have its port exposed to the network.

For example, to connect to an elasticsearch back end to an investigate demo, incant the following:

ssh -L 9200:localhost:9200 -Nf username@remote.host

You can then connect to localhost:9200 and it will be forwarded to localhost:9200 on the remote machine.

In general, the argument to -L is of the form:

local-port:hostname:remote-port

Note that the hostname is resolved from the remote machine's point of view, and so is usually localhost.