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    Thanks, muru! I wonder why is dynamic forwarding is called a proxy, while local forwarding isn't? By definition, is the ssh server, ssh client or both in local forwarding a proxy (server)? unix.stackexchange.com/a/234184/674 Commented Oct 7, 2015 at 16:53
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    @Tim a proxy server understands what the protocol that it is proxying. With port forwarding, SSH makes no attempt to understand what protocol is coming its way, but with -D, it has to, in order to understand where to send the data. Commented Oct 7, 2015 at 16:58
  • Thanks. I searched in some textbooks of computer networks (e.g. Tanenbaum's) for definition for a proxy (server) as clear as yours, but wasn't satisfied. Do you have some books to recommend for learning concepts? Commented Oct 7, 2015 at 17:01
  • In dynamic port forwarding, which is the proxy server, the ssh client, ssh server or both? Commented Oct 7, 2015 at 17:03
  • @Tim Tanenbaum's was the only book I studied from. The rest comes from using things. Commented Oct 7, 2015 at 17:03