Zyxel-communications 802.11g Wireless ADSL2+ 4-port VoIP IAD P-2602HWNL Instrukcja Użytkownika Pobierz pdf (Strona 17)

P-2602HWNLI User’s Guide

Table of Contents 17

13.3 Introduction to ZyXEL’s Firewall .....................................................................200

13.3.1 Denial of Service Attacks ......................................................................201

13.4 Denial of Service ............................................................................................201

13.4.1 Basics ...................................................................................................201

13.4.2 Types of DoS Attacks ...........................................................................202

13.4.2.1 ICMP Vulnerability ......................................................................204

13.4.2.2 Illegal Commands (NetBIOS and SMTP) ....................................204

13.4.2.3 Traceroute ...................................................................................205

13.5 Stateful Inspection ..........................................................................................205

13.5.1 Stateful Inspection Process ..................................................................206

13.5.2 Stateful Inspection on Your ZyXEL Device ...........................................207

13.5.3 TCP Security .........................................................................................207

13.5.4 UDP/ICMP Security ..............................................................................208

13.5.5 Upper Layer Protocols ..........................................................................208

13.6 Guidelines for Enhancing Security with Your Firewall ....................................209

13.6.1 Security In General ...............................................................................209

Chapter 14

Firewall Configuration ......................................................................................... 211

14.1 Access Methods .............................................................................................211

14.2 Firewall Policies Overview ............................................................................211

14.3 Rule Logic Overview .....................................................................................212

14.3.1 Rule Checklist .......................................................................................212

14.3.2 Security Ramifications ..........................................................................212

14.3.3 Key Fields For Configuring Rules .........................................................213

14.3.3.1 Action ..........................................................................................213

14.3.3.2 Service ........................................................................................213

14.3.3.3 Source Address ...........................................................................213

14.3.3.4 Destination Address ....................................................................213

14.4 Connection Direction ......................................................................................213

14.4.1 LAN to WAN Rules ...............................................................................214

14.4.2 Alerts .....................................................................................................214

14.5 Triangle Route ................................................................................................214

14.5.1 The “Triangle Route” Problem ..............................................................214

14.5.2 Solving the “Triangle Route” Problem ...................................................215

14.6 General Firewall Policy ...............................................................................216

14.7 Firewall Rules Summary ...............................................................................218

14.7.1 Configuring Firewall Rules ..................................................................219

14.7.2 Customized Services ...........................................................................222

14.7.3 Configuring A Customized Service .....................................................223

14.8 Example Firewall Rule ...................................................................................223

14.9 Predefined Services .......................................................................................227

14.10 Firewall Threshold ....................................................................................227

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 441 442

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