--- tools.pm.old	2007-03-09 14:48:03.000000000 +0100
+++ tools.pm	2007-03-09 14:48:35.000000000 +0100
@@ -29,12 +29,12 @@
 
 sub start_interface {
     my ($intf, $detach) = @_;
-    run_interface_command('/sbin/ifup', $intf, $detach);
+    run_interface_command('env -i /sbin/ifup', $intf, $detach);
 }
 
 sub stop_interface {
     my ($intf, $detach) = @_;
-    run_interface_command('/sbin/ifdown', $intf, $detach);
+    run_interface_command('env -i /sbin/ifdown', $intf, $detach);
 }
 
 sub start_net_interface {