ZyXEL Communications ZyWALL 10, Руководство пользователя

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ZyWALL 10 Internet Security Gateway
Table of Contents xiii
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 ZyWALL ................................................................................. 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 ZyWALL 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 ZyWALL Web Configurator ........................................................................ 15-1
15.1 Web Configurator Login and Welcome Screens ...................................................................... 15-1
15.2 Enabling the Firewall ............................................................................................................... 15-2
15.3 E-Mail....................................................................................................................................... 15-3