Zyxel-communications 662HW Series Manual do Utilizador descarregar pdf (Página 12)

Prestige 662H/HW Series User’s Guide

Chapter 12

Time and Date....................................................................................................... 142

12.1 Configuring Time and Date ............................................................................142

Chapter 13

Firewalls................................................................................................................ 144

13.1 Firewall Overview ...........................................................................................144

13.2 Types of Firewalls ..........................................................................................144

13.2.1 Packet Filtering Firewalls ......................................................................144

13.2.2 Application-level Firewalls ....................................................................144

13.2.3 Stateful Inspection Firewalls ................................................................145

13.3 Introduction to ZyXEL’s Firewall .....................................................................145

13.3.1 Denial of Service Attacks ......................................................................146

13.4 Denial of Service ............................................................................................146

13.4.1 Basics ...................................................................................................146

13.4.2 Types of DoS Attacks ...........................................................................147

13.4.2.1 ICMP Vulnerability ......................................................................149

13.4.2.2 Illegal Commands (NetBIOS and SMTP) ....................................149

13.4.2.3 Traceroute ...................................................................................150

13.5 Stateful Inspection ..........................................................................................150

13.5.1 Stateful Inspection Process ..................................................................151

13.5.2 Stateful Inspection and the Prestige .....................................................152

13.5.3 TCP Security .........................................................................................152

13.5.4 UDP/ICMP Security ..............................................................................153

13.5.5 Upper Layer Protocols ..........................................................................153

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

13.6.1 Security In General ...............................................................................154

13.7 Packet Filtering Vs Firewall ............................................................................155

13.7.1 Packet Filtering: ....................................................................................155

13.7.1.1 When To Use Filtering .................................................................155

13.7.2 Firewall .................................................................................................155

13.7.2.1 When To Use The Firewall ..........................................................156

Chapter 14

Firewall Configuration ......................................................................................... 158

14.1 Access Methods .............................................................................................158

14.2 Firewall Policies Overview .............................................................................158

14.3 Rule Logic Overview ......................................................................................159

14.3.1 Rule Checklist .......................................................................................159

14.3.2 Security Ramifications ..........................................................................160

14.3.3 Key Fields For Configuring Rules .........................................................160

14.3.3.1 Action ..........................................................................................160

14.3.3.2 Service ........................................................................................160

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 562 563

Sem comentários

Zyxel-communications 662HW Series Manual do Utilizador Página 12