The client sets all parameters such as Prox圜ommand when they appear the first time and ignores subsequent parameter values it encounters further down in the configuration file. Note that the SSH client proceeds from top to bottom when parsing the configuration file (see ssh_config(5)). In case the netcat command returns a non-zero exit status indicating failure, the condition of the Match is not satisfied and the SSH client looks for the next applicable Host or Match entry without setting the proxy setting. If that is the case, the netcat command returns a zero exit status and the SSH client will set Prox圜ommand to none meaning that SSH will use no proxy and connect directly to internal SSH server. ssh/config) executes the netcat ( nc) command under the user's shell to check whether a TCP connection the internal SSH server can be established. The following SSH configuration (can be placed in the user's home directory under. Let us assume that the host name of the internal SSH server is and that the host name of the jumpbox is. The idea is to check whether the user issuing the ssh command is connected to the VPN and then to either directly connect to the internal SSH server if possible or use the jumpbox as a proxy if necessary. Fabian's Lines of Thought Automatic SSH Proxy Selection Ī common network configuration is to utilize a VPN which allows the users to connect to internal servers providing services such as SSH.Īdditionally, some networks may offer external access (i.e., from outside the VPN) to a jumpbox from which internal servers can be reached.Ī suitable SSH configuration file allows you to seamlessly connect to an interval SSH service.
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