title: LAN agent using ssh
body: <p>I always need to ssh to a LAN machine (says vm1) which can not access the Internet. In some cases,
  I need to download some softwares in vm1 (says apt-get install stuffs ...), is there any ways to set
  up something to enable the remote machine vm1 be capable to access the Internet through the local 
  machine in the ssh session? thx!</p>