802.11g Wireless 4-port Router User's Guide
Table Of Contents
- User’s Guide
- Copyright
- Federal Communications Commission (FCC) Interference Statement
- ZyXEL Limited Warranty
- Customer Support
- Table of Contents
- List of Figures
- List of Tables
- Preface
- Getting to Know Your ZyAIR
- 1.1 Introducing the ZyAIR
- 1.2 ZyAIR Features
- 1.2.1 Physical Features
- 1.2.2 Firmware Features
- 1.2.2.1 Internal RADIUS Server
- 1.2.2.2 Wi-Fi Protected Access
- 1.2.2.3 802.11b Wireless LAN Standard
- 1.2.2.4 802.11g Wireless LAN Standard
- 1.2.2.5 STP (Spanning Tree Protocol) / RSTP (Rapid STP)
- 1.2.2.6 Certificates
- 1.2.2.7 Limit the number of Client Connections
- 1.2.2.8 SSL Passthrough
- 1.2.2.9 Firewall
- 1.2.2.10 Brute-Force Password Guessing Protection
- 1.2.2.11 Wireless LAN MAC Address Filtering
- 1.2.2.12 WEP Encryption
- 1.2.2.13 IEEE 802.1X Network Security
- 1.2.2.14 Universal Plug and Play (UPnP)
- 1.2.2.15 Dynamic DNS Support
- 1.2.2.16 PPPoE Support (RFC2516)
- 1.2.2.17 PPTP Encapsulation
- 1.2.2.18 Network Address Translation (NAT)
- 1.2.2.19 Traffic Redirect
- 1.2.2.20 NAT for Single-IP-address Internet Access
- 1.2.2.21 DHCP (Dynamic Host Configuration Protocol)
- 1.2.2.22 Multicast
- 1.2.2.23 IP Alias
- 1.2.2.24 IP Policy Routing
- 1.2.2.25 SNMP
- 1.2.2.26 Full Network Management
- 1.2.2.27 Logging and Tracing
- 1.2.2.28 Diagnostics Capabilities
- 1.2.2.29 Embedded FTP and TFTP Servers
- 1.2.2.30 Wireless Association List
- 1.2.2.31 Wireless LAN Channel Usage
- 1.3 Applications for the ZyAIR
- Introducing the Web Configurator
- Wizard Setup
- System Screens
- LAN Screens
- Wireless Configuration and Roaming
- Wireless Security
- 7.1 Wireless Security Overview
- 7.2 Security Parameters Summary
- 7.3 WEP Overview
- 7.4 Configuring WEP Encryption
- 7.5 Introduction to WPA
- 7.6 Configuring WPA-PSK Authentication
- 7.7 Wireless Client WPA Supplicants
- 7.8 Configuring WPA Authentication
- 7.9 Introduction to RADIUS
- 7.10 Configuring RADIUS
- 7.11 802.1x Overview
- 7.12 Dynamic WEP Key Exchange
- 7.13 Configuring 802.1x and Dynamic WEP Key Exchange
- 7.14 Configuring 802.1x and Static WEP Key Exchange
- 7.15 Configuring 802.1x
- 7.16 MAC Filter
- Internal RADIUS Server
- WAN
- Single User Account (SUA) / Network Address Translation (NAT)
- Static Route Screens
- Remote Management Screens
- UPnP
- Firewalls
- Firewall Screens
- Content Filtering
- Certificates
- 17.1 Certificates Overview
- 17.2 Self-signed Certificates
- 17.3 Configuration Summary
- 17.4 My Certificates
- 17.5 Certificate File Formats
- 17.6 Importing a Certificate
- 17.7 Creating a Certificate
- 17.8 My Certificate Details
- 17.9 Trusted CAs
- 17.10 Importing a Trusted CA’s Certificate
- 17.11 Trusted CA Certificate Details
- Log Screens
- Maintenance
- Introducing the SMT
- General Setup
- Menu 2 WAN Setup
- LAN Setup
- Internet Access
- Remote Node Configuration
- Static Route Setup
- Dial-in User Setup
- Network Address Translation (NAT)
- Filter Configuration
- Enabling the Firewall
- SNMP Configuration
- System Security
- System Information and Diagnosis
- Firmware and Configuration File Maintenance
- System Maintenance and Information
- Remote Management
- Call Scheduling
- Appendix A
- Appendix B
- Appendix C
- Appendix D
- Appendix E
- Appendix F
- Appendix G
- Appendix H
- Appendix I
- Appendix J
- Appendix K
- Appendix L
- Index
ZyAIR G-2000 Plus User’s Guide
183 Chapter 14 Firewalls
Figure 76 SYN Flood
b In a LAND Attack, hackers flood SYN packets into the network with
a spoofed source IP address of the targeted system. This makes it
appear as if the host computer sent the packets to itself, making the
system unavailable while the target system tries to respond to itself.
•A brute-force attack, such as a "Smurf" attack, targets a feature in the IP specification
known as directed or subnet broadcasting, to quickly flood the target network with
useless data. A Smurf hacker floods a router with Internet Control Message Protocol
(ICMP) echo request packets (pings). Since the destination IP address of each packet is
the broadcast address of the network, the router will broadcast the ICMP echo request
packet to all hosts on the network. If there are numerous hosts, this will create a large
amount of ICMP echo request and response traffic. If a hacker chooses to spoof the
source IP address of the ICMP echo request packet, the resulting ICMP traffic will not
only clog up the "intermediary" network, but will also congest the network of the spoofed
source IP address, known as the "victim" network. This flood of broadcast traffic
consumes all available bandwidth, making communications impossible.