ssh -o "CheckHostIP no" -o "HashKnownHosts no" -o "StrictHostKeyChecking no" -o "VerifyHostKeyDNS no" -o "UserKnownHostsFile /dev/null" -o "PasswordAuthentication yes" -o "PubkeyAuthentication yes" -o "ProxyCommand=ssh -vvv root@192.168.1.1 nc %h 22" -o "ServerAliveInterval=30" -x2MN -o "NumberOfPasswordPrompts=1" -o "PreferredAuthentications=publickey,keyboard-interactive,password" -S /tmp/zzz -l root 10.20.30.40