How to change the default binding ip of Rails 4.2 development server?

I’m having the same issue here and I found today a better solution. Just append this code to your config/boot.rb and it should work with vagrant.

require 'rails/commands/server'
module Rails
  class Server
    def default_options
      super.merge(Host:  '0.0.0.0', Port: 3000)
    end
  end
end

ps: Its based on: this answer