diff --git a/plugins/guests/debian/cap/configure_networks.rb b/plugins/guests/debian/cap/configure_networks.rb
index 49da980bf..3cb896b15 100644
--- a/plugins/guests/debian/cap/configure_networks.rb
+++ b/plugins/guests/debian/cap/configure_networks.rb
@@ -13,9 +13,8 @@ module VagrantPlugins
           machine.communicate.tap do |comm|
             # First, remove any previous network modifications
             # from the interface file.
-            comm.sudo("sed -e '/^#VAGRANT-BEGIN/,/^#VAGRANT-END/ d' /etc/network/interfaces > /tmp/vagrant-network-interfaces")
-            comm.sudo("su -c 'cat /tmp/vagrant-network-interfaces > /etc/network/interfaces'")
-            comm.sudo("rm -f /tmp/vagrant-network-interfaces")
+            comm.sudo("sed -e '/^#VAGRANT-BEGIN/,$ d' /etc/network/interfaces > /tmp/vagrant-network-interfaces.pre")
+            comm.sudo("sed -ne '/^#VAGRANT-END/,$ p' /etc/network/interfaces | tail -n +2 > /tmp/vagrant-network-interfaces.post")
 
             # Accumulate the configurations to add to the interfaces file as
             # well as what interfaces we're actually configuring since we use that
@@ -47,8 +46,8 @@ module VagrantPlugins
               comm.sudo("/sbin/ip addr flush dev eth#{interface} 2> /dev/null")
             end
 
-            comm.sudo("cat /tmp/vagrant-network-entry >> /etc/network/interfaces")
-            comm.sudo("rm -f /tmp/vagrant-network-entry")
+            comm.sudo('cat /tmp/vagrant-network-interfaces.pre /tmp/vagrant-network-entry /tmp/vagrant-network-interfaces.post > /etc/network/interfaces')
+            comm.sudo('rm -f /tmp/vagrant-network-interfaces.pre /tmp/vagrant-network-entry /tmp/vagrant-network-interfaces.post')
 
             # Bring back up each network interface, reconfigured
             interfaces.each do |interface|