![]() The server process listens on a high UDP port and sends its port number and an AES-128 secret key back to the client over SSH. SSH may prompt the user for a password or use public-key authentication to log in.įrom this point, mosh runs the mosh-server process (as the user) on the server machine. ![]() The mosh program will SSH to to establish the connection. ![]() ![]() There are more examples and a FAQ on the Mosh web site. More options are documented in the mosh(1) manual page. $ mosh the mosh-client or mosh-server binaries live outside the user's $PATH, mosh accepts the arguments -client=PATH and -server=PATH to select alternate locations. The mosh-client binary must exist on the user's machine, and the mosh-server binary on the remote host. We have confirmed that this is the case on GNU/Linux, OS X, and FreeBSD. If you are porting Mosh to a new operating system, please make sure that a running process's environment variables are not readable by other users. Note that mosh-client receives an AES session key as an environment variable. The Mosh web site has information about packages for many operating systems, as well as instructions for building from source. Mosh does not contain any privileged (root) code. This might be the reasons for why it isn't enabled by default.Mosh leverages SSH to set up the connection and authenticate users. A known-plaintext attack might become easier if the attacker knows the interval and contents of an idle connection. I highly recommend turning this feature on if you run into this regularly, but you should also know about the slight security risk it may impose. prevent you from having half-closed tcp sessions hanging for hours untouched. It is being noted that those keep-alives also help to, uhm, keep long-idling connections alive, i.e. Opposed to the other option TCPKeepAlive, this is checked within the encrypted channel and is not spoofable. Whenever three of them fail consecutively (the default of ServerAliveCountMax), the client considers the connection as hung and closes it. This makes ssh client send application-level keep-alives every 15 seconds. You may also want to setup application-level keep-alives for SSH to prevent it from freezing on connection issues. terminates an ssh session 5 layers deep and keeps the other 4 intact. (This only applies to ~s that directly follow an Enter.) That is to say that Enter ~ ~ ~ ~ ~. Notice that because hitting ~ ~ causes ssh to send the ~ instead of intercepting it, you can address N nested ssh connections by hitting ~ N times. You can close the list of Escape sequences by hitting Enter. (Note that escapes are only recognized immediately after newline.) ~~ - send the escape character by typing it twice ![]() ~& - background ssh (when waiting for connections to terminate) ~V/v - decrease/increase verbosity (LogLevel) terminate connection (and any multiplexed sessions) More of these escape sequences can be listed with Enter, ~, ?: Supported escape sequences: (Keep in mind that in international keyboards where ~ is set to be a composing character, you have to hit it twice: Enter, ~, ~. To kill the current session hit subsequently Enter, ~. Normal keys are forwarded over the ssh session, so none of those will work. ![]()
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