Zyxel-communications P-2602HW(L) Series Manuel d'utilisateur télécharger pdf (Page 14)

P-2602H(W)(L)-DxA Series User’s Guide

14 Table of Contents

11.15.3 USA Type Supplementary Services ....................................................170

11.15.3.1 USA Call Hold ............................................................................170

11.15.3.2 USA Call Waiting ......................................................................171

11.15.3.3 USA Call Transfer ......................................................................171

11.15.3.4 USA Three-Way Conference .....................................................171

11.16 Phone Region Screen .................................................................................171

11.17 Speed Dial ....................................................................................................172

11.17.1 Peer-to-Peer Calls ..............................................................................172

11.18 Speed Dial Screen .......................................................................................173

11.19 Incoming Call Policy Screen ........................................................................174

11.20 PSTN Line Screen (“L” models only) ...........................................................176

Chapter 12

Phone Usage ........................................................................................................ 179

12.1 Dialing a Telephone Number ..........................................................................179

12.2 Using Speed Dial to Dial a Telephone Number ..............................................179

12.3 Internal Calls ..................................................................................................179

12.4 Checking the Device’s IP Address .................................................................179

12.5 Auto Firmware Upgrade .................................................................................180

Chapter 13

Firewalls................................................................................................................ 181

13.1 Firewall Overview ..........................................................................................181

13.2 Types of Firewalls ..........................................................................................181

13.2.1 Packet Filtering Firewalls ......................................................................181

13.2.2 Application-level Firewalls ....................................................................182

13.2.3 Stateful Inspection Firewalls ................................................................182

13.3 Introduction to ZyXEL’s Firewall .....................................................................182

13.3.1 Denial of Service Attacks ......................................................................183

13.4 Denial of Service ............................................................................................183

13.4.1 Basics ...................................................................................................183

13.4.2 Types of DoS Attacks ...........................................................................184

13.4.2.1 ICMP Vulnerability ......................................................................186

13.4.2.2 Illegal Commands (NetBIOS and SMTP) ....................................186

13.4.2.3 Traceroute ...................................................................................187

13.5 Stateful Inspection ..........................................................................................187

13.5.1 Stateful Inspection Process ..................................................................188

13.5.2 Stateful Inspection on Your ZyXEL Device ...........................................188

13.5.3 TCP Security .........................................................................................189

13.5.4 UDP/ICMP Security ..............................................................................189

13.5.5 Upper Layer Protocols ..........................................................................190

13.6 Guidelines for Enhancing Security with Your Firewall ....................................190

13.6.1 Security In General ...............................................................................190

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