Zyxel-communications Broadband Security Gateway P-312 Manual de usuario descargar pdf (Pagina 13)

P312 Broadband Security Gateway

Table Of Contents xiii

12.2 Telnet Under NAT.................................................................................................................... 12-1

12.3 Telnet Capabilities.................................................................................................................... 12-1

12.3.1 Single Administrator ........................................................................................................ 12-1

12.3.2 System Timeout................................................................................................................ 12-2

12.4 Telnet Under the Firewall......................................................................................................... 12-2

Firewall and Content Filters............................................................................................................IV

Chapter 13 What is a Firewall......................................................................................................13-1

13.1 Types of Firewalls.................................................................................................................... 13-1

13.1.1 Packet Filtering Firewalls................................................................................................. 13-1

13.1.2 Application-level Firewalls .............................................................................................. 13-1

13.1.3 Stateful Inspection firewalls ............................................................................................. 13-2

13.2 Introduction to ZyXEL’s Firewall............................................................................................ 13-2

13.3 Denial of Service...................................................................................................................... 13-3

13.3.1 Basics................................................................................................................................ 13-3

13.3.2 Types of DoS attacks........................................................................................................ 13-4

13.4 Stateful Inspection.................................................................................................................... 13-6

13.4.1 Stateful Inspection Process............................................................................................... 13-7

13.4.2 Stateful Inspection & the Prestige .................................................................................... 13-8

13.4.3 TCP Security .................................................................................................................... 13-8

13.4.4 UDP/ICMP Security......................................................................................................... 13-9

13.4.5 Upper Layer Protocols...................................................................................................... 13-9

13.5 Guidelines For Enhancing Security With Your Firewall.......................................................... 13-9

13.5.1 Security In General......................................................................................................... 13-10

Chapter 14

Introducing the Prestige Firewall ..............................................................................14-1

14.1 SMT Menus.............................................................................................................................. 14-1

14.1.1 View Firewall Log............................................................................................................ 14-2

14.1.2 Attack Types..................................................................................................................... 14-2

14.2 The Big Picture – Filtering, Firewall and NAT........................................................................ 14-5

14.3 Packet Filtering Vs Firewall..................................................................................................... 14-6

14.3.1 Packet Filtering:................................................................................................................ 14-6

14.3.2 Firewall:............................................................................................................................ 14-7

Chapter 15

Introducing the Prestige Web Configurator...............................................................15-1

15.1 Web Configurator Login and Welcome Screens...................................................................... 15-1

15.2 Enabling the Firewall ............................................................................................................... 15-2

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Zyxel-communications Broadband Security Gateway P-312 Manual de usuario Pagina 13