autossh + plink

/root/bin/plinkssh.sh:

#!/bin/sh
export AUTOSSH_PATH=`which plink`
`which autossh` -M 5122 -N -R 12345:127.0.0.1:22 -pw blahblah root@10.***.***.*** 2>&1 >/dev/null &

chattr +i /root/bin/plinkssh.sh

/etc/rc.local:

/bin/sh /root/bin/plinkssh.sh