Zyxel-communications P-661H Series Manual de usuario descargar pdf (Pagina 15)

P-661H/HW Series User’s Guide

Table of Contents 15

Chapter 8

Firewalls................................................................................................................ 145

8.1 Firewall Overview ............................................................................................145

8.2 Types of Firewalls ............................................................................................145

8.2.1 Packet Filtering Firewalls ........................................................................145

8.2.2 Application-level Firewalls ......................................................................146

8.2.3 Stateful Inspection Firewalls ...................................................................146

8.3 Introduction to ZyXEL’s Firewall .......................................................................146

8.3.1 Denial of Service Attacks ........................................................................147

8.4 Denial of Service ..............................................................................................147

8.4.1 Basics .....................................................................................................147

8.4.2 Types of DoS Attacks .............................................................................148

8.4.2.1 ICMP Vulnerability ........................................................................150

8.4.2.2 Illegal Commands (NetBIOS and SMTP) ......................................150

8.4.2.3 Traceroute .....................................................................................151

8.5 Stateful Inspection ............................................................................................151

8.5.1 Stateful Inspection Process ....................................................................152

8.5.2 Stateful Inspection and the ZyXEL Device ..............................................152

8.5.3 TCP Security ...........................................................................................153

8.5.4 UDP/ICMP Security ................................................................................153

8.5.5 Upper Layer Protocols ............................................................................154

8.6 Guidelines for Enhancing Security with Your Firewall ......................................154

8.6.1 Security In General .................................................................................154

8.7 Packet Filtering Vs Firewall ..............................................................................155

8.7.1 Packet Filtering: ......................................................................................155

8.7.1.1 When To Use Filtering ...................................................................156

8.7.2 Firewall ...................................................................................................156

8.7.2.1 When To Use The Firewall ............................................................156

Chapter 9

Firewall Configuration ......................................................................................... 157

9.1 Access Methods ...............................................................................................157

9.2 Firewall Policies Overview ...............................................................................157

9.3 Rule Logic Overview ........................................................................................158

9.3.1 Rule Checklist .........................................................................................158

9.3.2 Security Ramifications ............................................................................158

9.3.3 Key Fields For Configuring Rules ...........................................................159

9.3.3.1 Action ............................................................................................159

9.3.3.2 Service ..........................................................................................159

9.3.3.3 Source Address .............................................................................159

9.3.3.4 Destination Address ......................................................................159

9.4 Connection Direction ........................................................................................159

9.4.1 LAN to WAN Rules .................................................................................160

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 382 383

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Zyxel-communications P-661H Series Manual de usuario Pagina 15

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