SSH Port Forwarding

# local port forwarding
# the target host 192.168.0.100 is running a service on port 8888
# and you want that service available on the localhost port 7777

ssh -L 7777:localhost:8888 user@192.168.0.100

# remote port forwarding
# you are running a service on localhost port 9999 
# and you want that service available on the target host 192.168.0.100 port 12340

ssh -R 12340:localhost:9999 user@192.168.0.100

# Local proxy through remote host
# You want to route network traffic through a remote host target.host
# so you create a local socks proxy on port 12001 and configure the SOCKS5 settings to localhost:12001

ssh -C2qTnN -D 12001 [e-mail]