Zyxel-communications P-2602R-DxA Series Manual de usuario descargar pdf (Pagina 16)

P-2602R/RL-DxA Series User’s Guide

16 Table of Contents

12.4.1 Basics ...................................................................................................151

12.4.2 Types of DoS Attacks ...........................................................................152

12.4.2.1 ICMP Vulnerability ......................................................................154

12.4.2.2 Illegal Commands (NetBIOS and SMTP) ....................................154

12.4.2.3 Traceroute ...................................................................................155

12.5 Stateful Inspection ..........................................................................................155

12.5.1 Stateful Inspection Process ..................................................................156

12.5.2 Stateful Inspection on Your ZyXEL Device ...........................................156

12.5.3 TCP Security .........................................................................................157

12.5.4 UDP/ICMP Security ..............................................................................157

12.5.5 Upper Layer Protocols ..........................................................................158

12.6 Guidelines for Enhancing Security with Your Firewall ....................................158

12.6.1 Security In General ...............................................................................158

12.7 Packet Filtering Vs Firewall ............................................................................159

12.7.1 Packet Filtering: ....................................................................................159

12.7.1.1 When To Use Filtering .................................................................160

12.7.2 Firewall .................................................................................................160

12.7.2.1 When To Use The Firewall ..........................................................160

Chapter 13

Firewall Configuration ......................................................................................... 161

13.1 Access Methods .............................................................................................161

13.2 Firewall Policies Overview ............................................................................161

13.3 Rule Logic Overview .....................................................................................162

13.3.1 Rule Checklist .......................................................................................162

13.3.2 Security Ramifications ..........................................................................162

13.3.3 Key Fields For Configuring Rules .........................................................163

13.3.3.1 Action ..........................................................................................163

13.3.3.2 Service ........................................................................................163

13.3.3.3 Source Address ...........................................................................163

13.3.3.4 Destination Address ....................................................................163

13.4 Connection Direction ......................................................................................163

13.4.1 LAN to WAN Rules ...............................................................................164

13.4.2 Alerts .....................................................................................................164

13.5 General Firewall Policy ...............................................................................164

13.6 Firewall Rules Summary ...............................................................................165

13.6.1 Configuring Firewall Rules ...................................................................167

13.6.2 Customized Services ............................................................................170

13.6.3 Configuring A Customized Service ......................................................171

13.7 Example Firewall Rule ...................................................................................171

13.8 DoS Thresholds ............................................................................................175

13.8.1 Threshold Values ..................................................................................175

13.8.2 Half-Open Sessions ..............................................................................176

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Zyxel-communications P-2602R-DxA Series Manual de usuario Pagina 16

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