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ZyWALL 10 Internet Security Gateway
Table of Contents xiii
11.2 Call Control Support ................................................................................................................ 11-2
11.2.1 Budget Management......................................................................................................... 11-2
11.2.2 Call History ...................................................................................................................... 11-3
11.3 Time and Date Setting.............................................................................................................. 11-4
How often does the ZyWALL update the time?............................................................................... 11-6
11.4 Remote Management Setup...................................................................................................... 11-7
11.5 Boot Commands....................................................................................................................... 11-8
Chapter 12 Telnet Configuration and Capabilities............................................................................. 12-1
12.1 About Telnet Configuration...................................................................................................... 12-1
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 Behind the Firewall ....................................................................................................... 12-2
Firewall and Content Filters......................................................................................................................... 13-1
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