Update optional proxy configuration to vagrant file

Vagrantfile

@@ -22,14 +22,15 @@ Vagrant.configure("2") do |config|
   config.vm.network "private_network", ip: "192.168.200.4", adapter: 2
   config.vm.hostname = "devbox.devops.detss.corpintra.net"
 
-  # proxy
+  # proxy configuration
   if ENV.key?("http_proxy")
+    # requires additional vagrant plugin vagrant-proxyconf
     config.proxy.http = ENV["http_proxy"]
     config.proxy.https = ENV["https_proxy"]
-    # config.proxy.no_proxy = "localhost,127.0.0.1"
+    config.proxy.no_proxy = ENV["no_proxy"]
   end
 
-  # requires additional vagrant plugin
+  # requires additional vagrant plugin vagrant-disksize
   config.disksize.size = "20GB"
 
   # configure VM settings and additional disks

proxy.sh

+#!/bin/sh
+
 export http_proxy=http://192.168.200.1:3128
 export https_proxy="$http_proxy"
+export no_proxy="localhost,127.0.0.1,192.168.200.0/24"
 export VAGRANT_HTTP_PROXY="$http_proxy"
-
-