Expose virtual machine (vagrant) to local Wifi
Solution 1:
The private_network is a network that is only between your host and the guest vm. If you want to make the guest vm available to others systems on the same network as your host you need to use the "public_network" setup in vagrant. This will allow your guest to get/use an IP address on the network that your host is on.
config.vm.network "public_network"
http://docs.vagrantup.com/v2/networking/public_network.html