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Appendix B: Wireless Security
What Are The Risks?
Wireless-G VPN Broadband Router
examples below, your implementation and administration of network security measures is the key to maximizing
wireless security.
No preventative measure will guarantee network security but it will make it more difficult for someone to hack
into your network. Often, hackers are looking for an easy target. Making your network less attractive to hackers,
by making it harder for them to get in, will make them look elsewhere.
How do you do this? Before discussing WEP, let's look at a few security measures often overlooked.
1)Network Content
Now that you know the risks assumed when networking wirelessly, you should view wireless networks as you
would the Internet. Don't host any systems or provide access to data on a wireless network that you wouldn't put
on the Internet.
2)Network Layout
When you first lay out your network, keep in mind where your wireless PCs are going to be located and try to
position your router towards the center of that network radius. Remember that access points transmit
indiscriminately in a radius; placing an access point at the edge of the physical network area reduces network
performance and leaves an opening for any hacker smart enough to discover where the router is transmitting.
This is an invitation for a man-in-the-middle attack, as described in the previous section. To perform this type of
attack, the hacker has to be physically close to your network. So, monitoring both your network and your property
is important. Furthermore, if you are suspicious of unauthorized network traffic, most wireless products come
with a log function, with which you can view activity on your network and verify if any unauthorized users have
had access.
3)Network Devices
With every wireless networking device you use, keep in mind that network settings (SSID, WEP keys, etc.) are
stored in its firmware. If they get into the hands of a hacker, so do all of your settings. So keep an eye on them.
4)Administrator passwords
Your network administrator is the only person who can change network settings. If a hacker gets a hold of the
administrator's password, he, too, can change those settings. So, make it harder for a hacker to get that
information. Change the administrator's password regularly.
5)SSID
- Wireless-G 1
- Copyright and Trademarks 2
- How to Use this Guide 2
- Table of Contents 3
- Chapter 1: Introduction 5
- What’s in this Guide? 6
- The Router’s Functions 8
- IP Addresses 8
- Why do I need a VPN? 9
- What is a VPN? 10
- VPN Router to VPN Router 11
- Chapter 3: 13
- The Front Panel 14
- Overview 15
- Wired Connection to a PC 16
- Wireless Connection to a PC 16
- Configuring Windows 2000 PCs 19
- Configuring Windows XP PCs 20
- Figure 5-8: IP Address 21
- Security 23
- Access Restrictions 23
- Applications & Gaming 23
- Administration 23
- The Setup Tab 24
- Network Setup 27
- DynDNS.org 28
- TZO.com Tab 28
- MAC Clone 29
- Advanced Routing 29
- Static Routing 30
- The Wireless Tab 31
- Wireless Security 32
- WEP (See Figure 6-13.) 32
- The Security Tab 35
- Advanced VPN Tunnel Setup 38
- 802.1x (See Figure 6-20.) 39
- The Access Restrictions Tab 40
- Port Range Forwarding 42
- Port Triggering 42
- UPnP Forwarding 43
- The Administration Tab 46
- Email Alert 47
- Syslog Notification 47
- Notification Qeue Length 48
- Alert Log 48
- General Log 48
- Ping Test (See Figure 6-32.) 48
- Information 50
- WAN Connections 50
- Local Network 51
- Wireless 52
- System Performance 52
- Appendix A: Troubleshooting 53
- Common Problems and Solutions 54
- Frequently Asked Questions 61
- Appendix B: Wireless Security 68
- Passive Attacks 69
- Jamming Attacks 69
- Active Attacks 70
- Man-in-the-Middle Attacks 70
- Maximizing Wireless Security 70
- What Are The Risks? 71
- Introduction 75
- Environment 75
- Filter List 1: win->router 76
- Filter List 2: router=>win 77
- Tunnel 1: win->router 79
- Tunnel 2: router->win 81
- Ethernet Adapter 86
- Wireless-G Broadband Router 87
- Appendix E: SNMP Functions 88
- Appendix G: Windows Help 90
- Appendix H: Glossary 91
- Appendix I: Specifications 97
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