title: Why "10.0.2.2" was not there with running "ifconfig"?
body: <p>As you know I use vagrant to manage one vm, when I login to the vm using <code>vagrant ssh</code>, the output shown that I was login from 10.0.2.2. So this IP was my host's IP . But why can not I see it with running ifconfig in my host? That confused me. (But I can found a record about 10.0.2.2 in the host route table) </p>
  
  <p>Any clue will be appreciated!</p>