Mount NFS with UDP protocol by default [GH-1706]

CHANGELOG.md

@@ -28,6 +28,9 @@ IMPROVEMENTS:
   - If Ansible fails to run properly, show an error message. [GH-1699]
   - Adding a box with the `--provider` flag will now allow a box for
     any of that provider's supported formats.
+  - NFS mounts enable UDP by default, resulting in higher performance.
+    (Because mount is over local network, packet loss is not an issue)
+   [GH-1706]
 
 BUG FIXES:
 

plugins/guests/linux/cap/mount_nfs.rb

@@ -18,7 +18,7 @@ module VagrantPlugins
             # Mount
             hostpath = opts[:hostpath].dup
             hostpath.gsub!("'", "'\\\\''")
-            mount_command = "mount -o vers=#{opts[:nfs_version]} #{ip}:'#{hostpath}' #{expanded_guest_path}"
+            mount_command = "mount -o udp,vers=#{opts[:nfs_version]} #{ip}:'#{hostpath}' #{expanded_guest_path}"
 
             retryable(:on => Vagrant::Errors::LinuxNFSMountFailed, :tries => 5, :sleep => 2) do
               machine.communicate.sudo(mount_command,