RemoteInvalidIP:RemotePort forward to LocalIP:LocalPort

ssh username@RemoteValidIP -L LocalIP:LocalPort:RemoteInvalidIP:RemotePort -N

LocalInvalidIP:LocalPort forward to Remote127.0.01:RemotePort

ssh username@RemoteValidIP -R RemotePort:LocalInvalidIP:LocalPort -N

Remote Desktop (rdp)

ssh 10.11.12.1 -L 172.16.20.2:3389:10.11.12.20:3389 -N

PCAnyWhere

ssh 10.11.12.1 -L 172.16.20.2:5631:10.11.12.20:5631 -D 172.16.20.2:5632 -N

SSH CallBack

ssh user@10.11.12.1 -R 2222:172.16.20.2:22 -N