--- a/src/node/ipv4-address-generator.cc	Sun Apr 06 06:24:33 2008 +0200
+++ a/src/node/ipv4-address-generator.cc	Tue Apr 15 10:45:09 2008 +0800
@@ -265,9 +269,7 @@ 
 
   std::list<Entry>::iterator i, j;
 
-  for (i = m_entries.begin (), j = m_entries.begin (), ++j; 
-       i != m_entries.end (); 
-       ++i, ++j)
+  for ( i = m_entries.begin(), j = i; i != m_entries.end (); ++ i, j = i)
     {
       NS_LOG_LOGIC ("examine entry: " << Ipv4Address ((*i).addrLow) << 
         " to " << Ipv4Address ((*i).addrHigh));
@@ -303,6 +305,7 @@ 
 // 
       if (addr == (*i).addrHigh + 1)
         {
+            j ++;
           if (j != m_entries.end ())
             {
               if (addr == (*j).addrLow)