From 911042e41348452121ee1069fc54d392a12463fc Mon Sep 17 00:00:00 2001
From: pimjager <pim@pimjager.nl>
Date: Tue, 29 Sep 2015 11:28:07 +0200
Subject: [PATCH] Intro: added explenation why iptables are needed

---
 1intro.tex | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/1intro.tex b/1intro.tex
index 7da3120..1faf5c8 100644
--- a/1intro.tex
+++ b/1intro.tex
@@ -18,7 +18,9 @@ Java\footnote{\url{http://www.java.com}} TCP driven echo server that executed
 on a virtualized Ubuntu system\footnote{\url{http://www.ubuntu.com}} running on
 the Linux kernel\footnote{\url{http://www.kernel.org}} version $3.13$. To test
 the error behaviour custom iptables output policies have to be
-set~\ref{listing:iptables}.
+set Listing~\ref{listing:iptables}. This is needen because the OS by default 
+closes all connections from unknown sources and the manually created TCP 
+connections used in testing the implementation are unknown to the OS.
 
 \begin{lstlisting}[label={listing:iptables},caption={settings iptables}]
 Chain OUTPUT (policy ACCEPT)
-- 
2.20.1