SSH TUNEL

ssh -t root@ip 'less /etc/passwd'

ssh -L 127.0.0.1:8080:127.0.0.1:9999 root@ip -N
ssh -R 127.0.0.1:8080:127.0.0.1:9999 root@ip
ssh -D 127.0.0.1:8080 root@ip