Host *
     ControlMaster auto
     ControlPath ~/.ssh/controlmasters/%r@%h:%p
     ControlPersist 300s
     ServerAliveInterval 30

Host 192.168.0.250
     Port 2222

Host *redalder.org 192.168.0.250
     ExitOnForwardFailure yes
     SendEnv INSIDE_EMACS
     RemoteForward /home/main/.ssh/emacs-server /run/user/1000/emacs/server