mergeee!!

ROUTER.sh

@@ -1,42 +1,33 @@
-# NETWORKS:
+#!/bin/bash
-# DMZ: 23.214.219.128/25
+
-# Internal: 192.168.10.0/24
-# 
-# MACHINES:
-# DNS2: 192.137.16.75
-# EDEN 193.138.212.1
 dns2="87.248.214.99"
 eden="87.248.214.100"
 
-# ==============================
 # Router 1
-# INTERFACES:
+dmzIP="23.214.219.254"
-# - Internet: 87.248.214.97
+internalIP="192.168.10.254"
-# - DMZ: 23.214.219.254
+externalIP="87.248.214.97"
-# - Internal: 192.168.10.254
-# ==============================
 
-# ==============================
 # DMZ /25
-# IP:
+dns="23.214.219.130"
-# - dns : 23.214.219.130
+smtp="23.214.219.131"
-# - smtp : 23.214.219.131
+www="23.214.219.132"
-# - www : 23.214.219.132
+vpn_gw="23.214.219.133"
-# - vpn-gw: 23.214.219.133
+mail="23.214.219.134"
-# - mail: 23.214.219.134
-# ==============================
 
-# ==============================
 # Internal
-# IP:
+ftp="192.168.10.2"
-# ftp: 192.168.10.2
+datastore="192.168.10.3"
-# datastore : 192.168.10.3
+dhcpClient="192.168.10.4"
-# DHCP Client : 192.168.10.4-5
-# ==============================
 
-sudo ifconfig enp0s8 23.214.219.254 netmask 255.255.255.128
+# Interfaces
-sudo ifconfig enp0s9 192.168.10.254 netmask 255.255.255.0
+dmzIF="enp0s8"
-sudo ifconfig enp0s10 87.248.214.97 netmask 255.255.255.0
+internalIF="enp0s9"
+externalIF="enp0s10"
+
+sudo ifconfig $dmzIF $dmzIP netmask 255.255.255.128
+sudo ifconfig $internalIF $internalIP netmask 255.255.255.0
+sudo ifconfig $externalIF $externalIP netmask 255.255.255.0
 
 sudo yum install iptables-services -y
 sudo systemctl stop firewalld
@@ -52,48 +43,64 @@ iptables -P FORWARD DROP
 iptables -P OUTPUT ACCEPT
 sudo iptables -A INPUT -i lo -j ACCEPT
 sudo iptables -A OUTPUT -o lo -j ACCEPT
-#sudo iptables -t nat -A POSTROUTING -i enp0s9 -o enp0s3 -j MASQUERADE #SUS
+
+#sudo iptables -t nat -A POSTROUTING -i $internalIF -o enp0s3 -j MASQUERADE #SUS
 sudo iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT #CAREFULL
+
 #DNS name resolution requests sent to outside servers and want a response:
-sudo iptables -A INPUT -o enp0s10 -p udp --dport 53 -j ACCEPT
+sudo iptables -A INPUT -i $externalIF -p udp --dport 53 -j ACCEPT
+
 #SSH connections to the router system that originate from the inside and want an answer:
-sudo iptables -A INPUT -i enp0s9 -p tcp --dport 22 -j ACCEPT
+sudo iptables -A INPUT -i $internalIF -p tcp --dport 22 -j ACCEPT
-sudo iptables -A INPUT -i enp0s8 -s 23.214.219.133 -p tcp --dport 22 -j ACCEPT
+sudo iptables -A INPUT -i $dmzIF -s $vpn_gw -p tcp --dport 22 -j ACCEPT
+
 #The dns server should be able to resolve names using the internet (and others???)
-sudo iptables -A FORWARD -i enp0s8 -o enp0s10 -s 23.214.219.130 -p udp --dport 53 -j ACCEPT
+sudo iptables -I FORWARD -j NFQUEUE --queue-bypass
+sudo iptables -I INPUT -j NFQUEUE --queue-bypass
+sudo iptables -A FORWARD -i $dmzIF -o $externalIF -s $dns -p udp --dport 53 -j ACCEPT
+
 #The internal network should be able to send and recieve dns name resolutions to the dns server (1!)
-sudo iptables -A FORWARD -i enp0s9 -o enp0s8 -d 23.214.219.130 -p udp --dport 53 -j ACCEPT
+sudo iptables -A FORWARD -i $internalIF -o $dmzIF -d $dns -p udp --dport 53 -j ACCEPT
 sudo iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT #THIS IS IMPORTANT AND MIGHT FUCK US
+
 #The dns and dns2 servers should be able to synchronize the contents of DNS zones. (protocol tcp port 53)
-sudo iptables -A FORWARD -i enp0s8 -o enp0s10 -s 23.214.219.130 -p tcp --dport 53 -j ACCEPT
+sudo iptables -A FORWARD -i $dmzIF -o $externalIF -s $dns -p tcp --dport 53 -j ACCEPT
+
 #SMTP connections to the smtp server and returns
-sudo iptables -A FORWARD -i enp0s9 -o enp0s8 -d 23.214.219.131 -p tcp --dport 587 -j ACCEPT 
+sudo iptables -A FORWARD -i $internalIF -o $dmzIF -d $smtp -p tcp --dport 587 -j ACCEPT 
-#sudo iptables -A FORWARD -i enp0s8 -o enp0s9 -p tcp --dport 587 -m state --state ESTABLISHED,RELATED -j ACCEPT
+#sudo iptables -A FORWARD -i $dmzIF -o $internalIF -p tcp --dport 587 -m state --state ESTABLISHED,RELATED -j ACCEPT
+
 #POP and IMAP connections to the www server
-sudo iptables -A FORWARD -i enp0s9 -o enp0s8 -d 23.214.219.134 -p tcp --dport 143 -j ACCEPT 
+sudo iptables -A FORWARD -i $internalIF -o $dmzIF -d $mail -p tcp --dport 143 -j ACCEPT 
-sudo iptables -A FORWARD -i enp0s9 -o enp0s8 -d 23.214.219.134 -p tcp --dport 110 -j ACCEPT
+sudo iptables -A FORWARD -i $internalIF -o $dmzIF -d $mail -p tcp --dport 110 -j ACCEPT
+
 #HTTP and HTTPS connectins
-sudo iptables -A FORWARD -i enp0s9 -o enp0s8 -d 23.214.219.132 -p tcp --dport 80 -j ACCEPT 
+sudo iptables -A FORWARD -i $internalIF -o $dmzIF -d $www -p tcp --dport 80 -j ACCEPT 
-sudo iptables -A FORWARD -i enp0s9 -o enp0s8 -d 23.214.219.132 -p tcp --dport 443 -j ACCEPT
+sudo iptables -A FORWARD -i $internalIF -o $dmzIF -d $www -p tcp --dport 443 -j ACCEPT
+
 #OpenVPN connections to the vpn-gw server
-sudo iptables -A FORWARD -i enp0s9 -o enp0s8 -d 23.214.219.133 -p udp --dport 1194 -j ACCEPT 
+sudo iptables -A FORWARD -i $internalIF -o $dmzIF -d $vpn_gw -p udp --dport 1194 -j ACCEPT 
-#sudo iptables -A FORWARD -i enp0s8 -o enp0s9 -p udp --dport 1194 -j ACCEPT
+#sudo iptables -A FORWARD -i $dmzIF -o $internalIF -p udp --dport 1194 -j ACCEPT
+
 #VPN clients connected to the gateway vpn-gw ???? vpn should be able to acess ftp e datastore
-sudo iptables -A FORWARD -i enp0s8 -o enp0s9 -s 23.214.219.133 -d 192.168.10.2 -j ACCEPT 
+sudo iptables -A FORWARD -i $dmzIF -o $internalIF -s $vpn_gw -d $ftp -j ACCEPT 
-sudo iptables -A FORWARD -i enp0s8 -o enp0s9 -s 23.214.219.133 -d 192.168.10.3 -j ACCEPT 
+sudo iptables -A FORWARD -i $dmzIF -o $internalIF -s $vpn_gw -d $datastore -j ACCEPT 
+
 #FTP da internet WORRIED ???
-sudo iptables -A FORWARD -i enp0s10 -o enp0s9 -d 192.168.10.2 -p tcp --dport 21 -j ACCEPT
+sudo iptables -A FORWARD -i $externalIF -o $internalIF -d $ftp -p tcp --dport 21 -j ACCEPT
-sudo iptables -A FORWARD -i enp0s9 -o enp0s10 -p tcp --sport 20 -j ACCEPT #MIGHT BE NEEDED
+sudo iptables -A FORWARD -i $internalIF -o $externalIF -p tcp --sport 20 -j ACCEPT #MIGHT BE NEEDED
+
 #SSH CONNECTIONS datastore server but only from eden or dn2 DNAT -s servers, and port and -d interface
-sudo iptables -t nat -A PREROUTING -s $dns2 -p tcp --dport 22 -j DNAT --to-destination 192.168.10.3
+sudo iptables -t nat -A PREROUTING -s $dns2 -p tcp --dport 22 -j DNAT --to-destination $datastore
-sudo iptables -t nat -A PREROUTING -s $eden -p tcp --dport 22 -j DNAT --to-destination 192.168.10.3
+sudo iptables -t nat -A PREROUTING -s $eden -p tcp --dport 22 -j DNAT --to-destination $datastore
-sudo iptables -t nat -A PREROUTING -i enp0s10 -p tcp --dport 21 -j DNAT --to-destination 192.168.10.2
+sudo iptables -t nat -A PREROUTING -i $externalIF -p tcp --dport 21 -j DNAT --to-destination $ftp
-sudo iptables -A FORWARD -i enp0s10 -o enp0s9 -d 192.168.10.3 -s $dns2 -p tcp --dport 22 -j ACCEPT #Need to check and make diferent ip addresses
+sudo iptables -A FORWARD -i $externalIF -o $internalIF -d $datastore -s $dns2 -p tcp --dport 22 -j ACCEPT #Need to check and make diferent ip addresses
-sudo iptables -A FORWARD -i enp0s10 -o enp0s9 -d 192.168.10.3 -s $eden -p tcp --dport 22 -j ACCEPT
+sudo iptables -A FORWARD -i $externalIF -o $internalIF -d $datastore -s $eden -p tcp --dport 22 -j ACCEPT
-#enp0s9 to internet DNS, http, https, ssh, FTP(SERVERS??????(WHO INVITED THIS GUY)) SNAT
+
-sudo iptables -t nat -A POSTROUTING -s 192.168.10.0/24 -o enp0s10 -j SNAT --to-source 87.248.214.97
+#$internalIF to internet DNS, http, https, ssh, FTP(SERVERS??????(WHO INVITED THIS GUY)) SNAT
-sudo iptables -A FORWARD -i enp0s9 -o enp0s10 -p udp --dport 53 -j ACCEPT 
+sudo iptables -t nat -A POSTROUTING -s 192.168.10.0/24 -o $externalIF -j SNAT --to-source $externalIP
-sudo iptables -A FORWARD -i enp0s9 -o enp0s10 -p tcp --dport 80 -j ACCEPT 
+sudo iptables -A FORWARD -i $internalIF -o $externalIF -p udp --dport 53 -j ACCEPT 
-sudo iptables -A FORWARD -i enp0s9 -o enp0s10 -p tcp --dport 443 -j ACCEPT
+sudo iptables -A FORWARD -i $internalIF -o $externalIF -p tcp --dport 80 -j ACCEPT 
-sudo iptables -A FORWARD -i enp0s9 -o enp0s10 -p tcp --sport 21 -j ACCEPT #MIGHT NOT BE ENOUGH
+sudo iptables -A FORWARD -i $internalIF -o $externalIF -p tcp --dport 443 -j ACCEPT
-sudo iptables -A FORWARD -i enp0s9 -o enp0s10 -p tcp --dport 21 -j ACCEPT
+sudo iptables -A FORWARD -i $internalIF -o $externalIF -p tcp --sport 21 -j ACCEPT #MIGHT NOT BE ENOUGH
+sudo iptables -A FORWARD -i $internalIF -o $externalIF -p tcp --dport 21 -j ACCEPT

relatorio.aux

@@ -5,10 +5,9 @@
 \babel@aux{portuguese}{}
 \@writefile{toc}{\contentsline {section}{\numberline {1}Introduction}{2}{}\protected@file@percent }
 \@writefile{toc}{\contentsline {section}{\numberline {2}Firewall}{2}{}\protected@file@percent }
-\@writefile{toc}{\contentsline {subsection}{\numberline {2.1}Packet fileter with NAT}{2}{}\protected@file@percent }
+\@writefile{toc}{\contentsline {subsection}{\numberline {2.1}Packet fileter without NAT}{2}{}\protected@file@percent }
-\@writefile{toc}{\contentsline {subsection}{\numberline {2.2}Packet filtering without NAT}{2}{}\protected@file@percent }
+\@writefile{toc}{\contentsline {subsection}{\numberline {2.2}Packet filtering with NAT}{3}{}\protected@file@percent }
-\@writefile{toc}{\contentsline {subsection}{\numberline {2.3}External Network}{2}{}\protected@file@percent }
+\@writefile{toc}{\contentsline {section}{\numberline {3}Intrusion Detection}{4}{}\protected@file@percent }
-\@writefile{toc}{\contentsline {subsection}{\numberline {2.4}Internal Network}{2}{}\protected@file@percent }
+\@writefile{toc}{\contentsline {section}{\numberline {4}Tests utilizados}{5}{}\protected@file@percent }
-\@writefile{toc}{\contentsline {section}{\numberline {3}Intrusion Detection}{2}{}\protected@file@percent }
+\@writefile{toc}{\contentsline {section}{\numberline {5}Conclusion}{5}{}\protected@file@percent }
-\@writefile{toc}{\contentsline {section}{\numberline {4}Conclusion}{2}{}\protected@file@percent }
+\gdef \@abspage@last{5}
-\gdef \@abspage@last{2}

relatorio.log

@@ -1,4 +1,4 @@
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+ria[][]ao de sce-na-rios em VMs, a configura[][]ao
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+
+
+
+[5] (/home/vasco/EngenhariaInformatica/3ano/sem2/fsi/trabalho/relatorio.aux)
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relatorio.tex

@@ -1,6 +1,23 @@
 \documentclass[12pt,a4paper]{article}
 \usepackage[portuguese]{babel}
 \usepackage[lining]{ebgaramond}
+\usepackage{listings}
+
+\lstdefinestyle{mystyle}{
+    basicstyle=\ttfamily\footnotesize,
+    breakatwhitespace=false,         
+    breaklines=true,                 
+    captionpos=b,                    
+    keepspaces=true,                 
+    numbers=left,                    
+    numbersep=5pt,                  
+    showspaces=false,                
+    showstringspaces=false,
+    showtabs=false,                  
+    tabsize=2
+}
+
+\lstset{style=mystyle}
 
 \title{Practical Assignment \#1}
 \author{
@@ -15,19 +32,32 @@
 
 \section{Introduction}
 O objetivo principal deste trabalho era aprender IPTables e como configurar um com o Suricata um sistema de filtração e deteção de ataques. Para esse fim, foi simulado um sistema dividido em três redes e um router para conectar-las. As três redes são a DMZ (23.214.219.128/25, enp0s8), Internal network (192.168.10.0/24, enp0s9) e Internet (87.248.214.0/24, enp0s10).
+
+\begin{lstlisting}[language=bash]
+Rede,Interface,Gama IP
+DMZ,enp0s8,23.214.219.128/25
+Internal,enp0s9,192.168.10.0/24
+Internet,enp0s10,87.248.214.0/24
+\end{lstlisting}
 As três redes tem varios serviços, o DMZ tem dns(23.214.219.130), mail(23.214.219.134), vpn-gw(23.214.219.133), www(23.214.219.132) e smpt(23.214.219.131). A Internal network tem ftp(192.168.10.2), datastore(192.168.10.3) e clientes (nos testes os clientes tem ip 192.168.10.4, mas está configurado para dar para qualquer edereço). Por fim a rede Internet tem dns2 (87.248.214.99) e eden (87.248.214.100), existe também outros serviços (87.248.214.98).
+Para facilitar a recriação deste sistema foi criado 4 ficheiros .sh (um para cada rede e o router), e disponibilizamos os ficheiros suricata.rules e suricata.yaml, para o suricata que estiver ligado ao Router.  Os ficheiros .sh vão ter comandos para configurar o sistema para este exercicio.
 \section{Firewall}
 \subsection{Packet fileter without NAT}
 O policy que foi escolhido foi:
+\begin{lstlisting}[language=bash]
 iptables -P INPUT DROP
 iptables -P FORWARD DROP
 iptables -P OUTPUT ACCEPT
+\end{lstlisting}
 Foi escolhido porque é mais facil dar DROP a todos os pacotes que não foi criado regras do que criar uma regra de DROP para todos os protocolos e possibilidades, o OUTPUT ficou para ACCEPT porque não existe razão para dar DROP dos pacotes que estamos a enviar neste trabalho.
 Para o router conseguir resolver DNS requests e para aceitar coneções SSH da rede interna ou da VPN gateway foi utilizado estes comandos:
-sudo iptables -A INPUT -o enp0s10 -p udp --dport 53 -j ACCEPT
+\begin{lstlisting}[language=bash]
+sudo iptables -A INPUT -i enp0s10 -p udp --dport 53 -j ACCEPT
 sudo iptables -A INPUT -i enp0s9 -p tcp --dport 22 -j ACCEPT
 sudo iptables -A INPUT -i enp0s8 -s 23.214.219.133 -p tcp --dport 22 -j ACCEPT
+\end{lstlisting}
 Para conseguirmos a confirguração pedida entre redes foi utilizado estes commandos:
+\begin{lstlisting}[language=bash]
 sudo iptables -A FORWARD -i enp0s8 -o enp0s10 -s 23.214.219.130 -p udp --dport 53 -j ACCEPT
 sudo iptables -A FORWARD -i enp0s9 -o enp0s8 -d 23.214.219.130 -p udp --dport 53 -j ACCEPT
 sudo iptables -A FORWARD -i enp0s8 -o enp0s10 -s 23.214.219.130 -p tcp --dport 53 -j ACCEPT
@@ -39,8 +69,20 @@ sudo iptables -A FORWARD -i enp0s9 -o enp0s8 -d 23.214.219.132 -p tcp --dport 44
 sudo iptables -A FORWARD -i enp0s9 -o enp0s8 -d 23.214.219.133 -p udp --dport 1194 -j ACCEPT 
 sudo iptables -A FORWARD -i enp0s8 -o enp0s9 -s 23.214.219.133 -d 192.168.10.2 -j ACCEPT 
 sudo iptables -A FORWARD -i enp0s8 -o enp0s9 -s 23.214.219.133 -d 192.168.10.3 -j ACCEPT
+\end{lstlisting}
+Inicialmente as implementações de respostas a forward eram especificas para cada regra isto é por exemplo:
+\begin{lstlisting}[language=bash]
+sudo iptables -A FORWARD -o enp0s8 -i enp0s10 -p udp --dport 53 -m state --state ESTABLISHED,RELATED -j ACCEPT
+\end{lstlisting}
+No entanto isso facilmente originava confusão entre nós, então decimos utilizar estas duas regras:
+\begin{lstlisting}[language=bash]
+sudo iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
+sudo iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
+\end{lstlisting}
+Neste cenario o uso destas regras faz sentido, mas pode existir outros cenarios no futuro que não queremos uma resposta, e nesse caso temos de criar as regras necessarias.
 \subsection{Packet filtering with NAT}
-Para conecções com origem/destino na internet foi utilizado DNAT/SNAT e iptables para "esconder" o ip para a internet que quer aceder a rede interna e iproutes para bloquear certos pacotes de entrar, para conseguir a configuração utilizamos estes comandos:
+Para conecções com origem/destino na internet foi utilizado DNAT/SNAT e iptables para "esconder" o ip para a internet que querer aceder a rede interna para não terem acesso ao edereço ip e iproutes para bloquear certos pacotes de entrar, para conseguir a configuração utilizamos estes comandos:
+\begin{lstlisting}[language=bash]
 sudo iptables -A FORWARD -i enp0s10 -o enp0s9 -d 192.168.10.2 -p tcp --dport 21 -j ACCEPT
 sudo iptables -A FORWARD -i enp0s9 -o enp0s10 -p tcp --sport 20 -j ACCEPT
 sudo iptables -t nat -A PREROUTING -s $dns2 -p tcp --dport 22 -j DNAT --to-destination 192.168.10.3
@@ -48,16 +90,37 @@ sudo iptables -t nat -A PREROUTING -s $eden -p tcp --dport 22 -j DNAT --to-desti
 sudo iptables -t nat -A PREROUTING -i enp0s10 -p tcp --dport 21 -j DNAT --to-destination 192.168.10.2
 sudo iptables -A FORWARD -i enp0s10 -o enp0s9 -d 192.168.10.3 -s $dns2 -p tcp --dport 22 -j ACCEPT
 sudo iptables -A FORWARD -i enp0s10 -o enp0s9 -d 192.168.10.3 -s $eden -p tcp --dport 22 -j ACCEPT
-\subsection{External Network}
+sudo iptables -t nat -A POSTROUTING -s 192.168.10.0/24 -o enp0s10 -j SNAT --to-source 87.248.214.97
-\subsection{Internal Network}
+sudo iptables -A FORWARD -i enp0s9 -o enp0s10 -p udp --dport 53 -j ACCEPT 
+sudo iptables -A FORWARD -i enp0s9 -o enp0s10 -p tcp --dport 80 -j ACCEPT 
+sudo iptables -A FORWARD -i enp0s9 -o enp0s10 -p tcp --dport 443 -j ACCEPT
+sudo iptables -A FORWARD -i enp0s9 -o enp0s10 -p tcp --sport 21 -j ACCEPT
+sudo iptables -A FORWARD -i enp0s9 -o enp0s10 -p tcp --dport 21 -j ACCEPT
+\end{lstlisting}
 
 \section{Intrusion Detection}
-Suricata rules:
+As regras que utilizamos para o suricata foram estas:
-drop tcp (dollar)EXTERNAL-NET any -> (dollar)HOME-NET any (msg:"ET"; flags:S; threshold:type both, track by-src, count 5, seconds 60; classtype:attempted-recon; sid:1000001; rev:1;)
+\begin{lstlisting}[language=bash]
+drop tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET"; flags:S; threshold:type both, track by_src, count 5, seconds 60; classtype:attempted-recon; sid:1000001; rev:1;)
 drop tcp any any -> any 80 (msg:"SQL injection"; content:"union"; nocase; content:"select"; nocase; classtype:web-application-attack; sid:1000002; rev:1;)
 drop tcp any any -> any 80 (msg:"SQl injection"; content:"'or 1=1"; nocase; classtype:web-application-attack; sid:1000003; rev:1;)
 drop tcp any any -> any 80 (msg:"XSS"; content:"<script"; nocase; classtype:web-application-attack; sid:1000004; rev:1;)
+\end{lstlisting}
+A primeira é para port scaning, a segunda e a terceira é para o caso de SQL injection, e a ultima é para XSS atacks.
+Também atualizamos o iptables para passar para o suricata os pacotes para analizar e bloquear com:
+\begin{lstlisting}[language=bash]
+sudo iptables -I FORWARD -j NFQUEUE --queue-bypass
+sudo iptables -I INPUT -j NFQUEUE --queue-bypass
+\end{lstlisting}
+
+\section{Tests utilizados}
+Netcat foi utilizado para maior parte dos testes excepto para FTP, em que devido ás suas caracteristicas especificas, utilizamos os serviços para ter a certeza que funcionava com a nossa configuração. Utilizamos estes comandos curl para testar se eram bloqueados:
+\begin{lstlisting}[language=bash]
+curl -i "http://23.214.219.132/index.php?id=1%20union%20select%201,2,3"
+curl -i "http://23.214.219.132/login.php?user='or%201=1"
+curl -i "http://23.214.219.132/search.php?q=<script>alert('XSS')</script>"
+\end{lstlisting}
 
 \section{Conclusion}
-Fuck we learned alot
+Ao realizar-mos este projeto aprendemos sobre a criação de scenarios em VMs, a configuração de uma firewall utilizando IPTables e a configuração de um IDS/IPS system utilizando Suricata
 \end{document}

relatorio.toc

@@ -1,9 +1,8 @@
 \babel@toc {portuguese}{}\relax 
 \contentsline {section}{\numberline {1}Introduction}{2}{}%
 \contentsline {section}{\numberline {2}Firewall}{2}{}%
-\contentsline {subsection}{\numberline {2.1}Packet fileter with NAT}{2}{}%
+\contentsline {subsection}{\numberline {2.1}Packet fileter without NAT}{2}{}%
-\contentsline {subsection}{\numberline {2.2}Packet filtering without NAT}{2}{}%
+\contentsline {subsection}{\numberline {2.2}Packet filtering with NAT}{3}{}%
-\contentsline {subsection}{\numberline {2.3}External Network}{2}{}%
+\contentsline {section}{\numberline {3}Intrusion Detection}{4}{}%
-\contentsline {subsection}{\numberline {2.4}Internal Network}{2}{}%
+\contentsline {section}{\numberline {4}Tests utilizados}{5}{}%
-\contentsline {section}{\numberline {3}Intrusion Detection}{2}{}%
+\contentsline {section}{\numberline {5}Conclusion}{5}{}%
-\contentsline {section}{\numberline {4}Conclusion}{2}{}%

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