From fca59bea770346cf1c1f9b0e00cb48a61b44a8f3 Mon Sep 17 00:00:00 2001
From: Harald Welte <laforge@gnumonks.org>
Date: Sun, 25 Oct 2015 21:00:20 +0100
Subject: import of old now defunct presentation slides svn repo

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+
+%     Registration              nfsim: Untested code is buggy code            
+%  [2]Register/Submit Rusty Russell (rusty@rustcorp.com.au)                   
+%                     Co-Author: Jeremy Kerr (jk@ozlabs.org)                  
+
+The netfilter simulation environment (nfsim) allows     
+netfilter developers to build, run, and test their code 
+without having to touch a real network, or being root.  
+On top of this, we built a regression testsuite for     
+netfilter and iptables.                                 
+
+Nfsim provides an emulated kernel environment in        
+userspace, with a simulated IPv4 stack, as well as      
+enhanced versions of standard kernel primitives such as 
+locking and a proc filesystem. The kernel code is       
+sucked into the nfsim environment, and run as a         
+userspace application with a scriptable command-line    
+interface which can load and unload modules, add a      
+route, inject a packet or run iptables, control time,   
+inspect proc, etc.                                      
+
+More importantly we can test every single permutation   
+of external failures automatically: packet drops,       
+kmalloc failures, timer deletion races, etc. This makes 
+it possible to check error paths that never happen in   
+real life.                                              
+
+This paper will discuss some of our experiences with    
+nfsim and the progression of the netfilter testsuite as 
+new features became available in the simulator, and the 
+amazing effect on development. We will also show the    
+techniques we used for exhaustive testing, and why      
+these should be a part of every project.                
+
+
+
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