Zyxel-communications Prestige 2602R Series Manual de usuario Pagina 13

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Prestige 2602R Series User’s Guide
Table of Contents 13
8.10.3.2 USA Call Waiting ........................................................................122
8.10.3.3 USA Call Transfer .......................................................................122
8.10.3.4 USA Three-Way Conference .......................................................122
8.11 Common Phone Port Configuration ...............................................................123
8.12 Call Forward Configuration ............................................................................124
Chapter 9
Phone Usage ........................................................................................................ 127
9.1 Dialing a Telephone Number ............................................................................127
9.2 Using Speed Dial to Dial a Telephone Number ................................................127
9.3 Internal Calls ....................................................................................................127
9.4 Checking the Prestige’s IP Address .................................................................127
9.5 Auto Firmware Upgrade ...................................................................................128
Chapter 10
Dynamic DNS Setup............................................................................................. 129
10.1 Dynamic DNS .................................................................................................129
10.1.1 DYNDNS Wildcard ................................................................................129
10.2 Configuring Dynamic DNS .............................................................................129
Chapter 11
Time and Date....................................................................................................... 131
11.1 Pre-defined NTP Time Servers List ................................................................131
11.2 Configuring Time and Date .............................................................................131
Chapter 12
Firewalls................................................................................................................ 135
12.1 Firewall Overview ...........................................................................................135
12.2 Types of Firewalls ..........................................................................................135
12.2.1 Packet Filtering Firewalls ......................................................................135
12.2.2 Application-level Firewalls ....................................................................135
12.2.3 Stateful Inspection Firewalls ................................................................136
12.3 Introduction to ZyXEL’s Firewall .....................................................................136
12.3.1 Denial of Service Attacks ......................................................................137
12.4 Denial of Service ............................................................................................137
12.4.1 Basics ...................................................................................................137
12.4.2 Types of DoS Attacks ...........................................................................138
12.4.2.1 ICMP Vulnerability ......................................................................140
12.4.2.2 Illegal Commands (NetBIOS and SMTP) ....................................140
12.4.2.3 Traceroute ...................................................................................141
12.5 Stateful Inspection ..........................................................................................141
12.5.1 Stateful Inspection Process ..................................................................142
12.5.2 Stateful Inspection and the Prestige .....................................................143
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