Hello,

Networking noob here. Nice to meet everyone!

I have created a Vagrantfile where I use a variable that allows me to 
switch between public or private networking types:

https://github.com/mhulse/vagrant-latmp/blob/382ca7463570f751a1f39d258cb4936c7b9640ba/Vagrantfile

I am not sure if I fully understand which network type is most optimal to 
use and when ...


   - *When would I want to use private over public?*
   - *Which one would work best (or at all) with forwarded ports?*
   - *What is the advantage to one over the other?*
   

Here's my current understanding (could some one confirm/deny/correct my 
assumptions):


   1. NAT port forwarding = "private_network"
      - Connect, from host, using "localhost"
      - Port forwarding works (why? because localhost is used by host 
      machine and ports could collide?)
      - Setting "auto_correct" will fix any port collisions between guest 
      and host
   2. Public Network (VirtualBox Bridged networking) = "public_network"
      - You have to connect using IP address of box (DHCP or defined 
      via config.vm.network.ip)
      - Port forwarding does not work (why? is this because the machine 
      handles this via Apache/Tomcat, etc, and using IP means no sharing by 
host 
      machine so no ports would collide?)
      - Setting "auto_correct" is not needed because port forwarding isn't 
      needed (or is ignored by Vagrant when network type is "public"?)
   

So it sounds like, to clarify my thoughts/understanding further:


   - Use "private_network" (Vagrant default) if you want to use "localhost" 
   and use port forwarding to avoid port collisions between guest VM and host 
   machine.
   - Use "public_network" if you want to connect to VM using IP address; 
   port forwarding is not required because VM uses it's own IP address so 
   ports will not collide between guest VM and host machine.
   

Does that sound right?

One last question:


   - *If you use "private_network", and provide an IP, do you still have to 
   worry about forwarded ports and collisions (assuming yes)?*
   
Thanks so much for taking the time to read/help. Sorry if noob questions. 
Just trying to learn and become more aware of how things work. :)

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