![]() ![]() Obviously any case where A= C gives no direct advantage over simple A -> D connection, but there are other useful cases. Some of these letters may refer to same machine in some particular usage cases. D is any server, it sees communication from C and may not be aware that A and B are involved there may be many servers.C is the $hostname B connects to communication that normally goes to D from A now reaches D from C.B is the machine where ssh -D $port_number C runs and where the TCP $port_number listens for incoming connections from any A.A represents a single client that uses B:$port_number as SOCKS address there may be many clients. ![]() But with proxy this is as follows: A -> B -> C -> D In general the situation without SOCKS proxy provided by ssh is like this: A -> D ![]() Note you may not be allowed to open some ports as regular user, especially lower than 1024, use higher number then. This will open the $port_number TCP port on your local computer and establish a SOCKS server on it. You need to provide credentials (like $username and password when asked) valid to the $hostname machine. The first command will use your current (local) username unless your ssh_config file tells otherwise (by default it doesn't). Or ssh -D $port_number $hostname identifies some machine it can be IP address, address resolvable via DNS or via /etc/hosts file or via ssh_config file etc. Usage of ssh -D is indeed like this: ssh -D $port_number $hostname This syntax is not meant to be fully compatible with variables in any shell. Note: I use $ prefix for strings you have to substitute with your desired values. ![]()
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