SSH Proxy Tunnel Example

helper.sh

# bring up the ssh tunnel without requiring leaving a terminal open 
# by opening a connection without a shell with the -N option.
# nohup helps to keep open the connection.
# provide an optional log, which might help troubleshooting.
# combine stderr and stdout( 2>&1 )
# send to background ( & )
connect() {
  nohup ssh tunnel -N > ~/.tunnel.log 2>&1 &
 }

ssh_config

#
# The ssh host that is allowed to connect to the target
# Set any credentials you need here, like username and id file...
#
Host proxy.example.org
 User me
 ForwardAgent yes

#
# the ssh config that sets up forwarded ports through the proxy
# Configs should match what the target server expects.
# The ProxyCommand, does the magic. Configure different credentials, if needed on your proxy host config.
#
Host tunnel
  HostName target.example.org
  User me
  IdentityFile ~/.ssh/id_rsa
  ProxyCommand ssh -W %h:%p proxy.example.org
  LocalForward 33891 target.example.org:22
  LocalForward 8081 target.example.org:80

#
# OPTIONAL:
# If you were to get a shell on the target,
# create this entry that points to localhost and the port you are forwarding
# on the proxy host config.
Host target
  HostName localhost
  Port 33891
  User me
  IdentityFile ~/.ssh/id_rsa
  ForwardAgent yes