--- a/tutorial/tutorial-csma-echo.cc	Mon Apr 07 10:38:37 2008 -0700
+++ b/tutorial/tutorial-csma-echo.cc	Mon Apr 07 10:41:21 2008 -0700
@@ -42,7 +42,7 @@
 
   Ipv4AddressHelper ipv4;
   ipv4.SetBase ("10.1.1.0", "255.255.255.0");
-  Ipv4InterfaceContainer i = ipv4.Allocate (nd);
+  Ipv4InterfaceContainer i = ipv4.Assign (nd);
 
   uint16_t port = 7;