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The implementation of this algorithm MUST support a time value T larger than a 32-bit integer when it is beyond the year 2038.
sshtun is a daemon that executes an ssh command to form a secure tunnel and then blocks on it. If the tunnel goes down, sshtun can attempt to reestablish it. It can also be set up to monitor a file on an http server to determine if the tunnel should be up or not, so you can switch it on or off remotely.