Networks. Area 2 SIR Presentation. Dean Steichen Br. 8

Transcription

1 Secure Wireless Home Networks Area 2 SIR Presentation Nov. 18, 2004 Dean Steichen Br. 8

2 Typical Home Computer Setup

3 And Now - Two or more PC s

4 One way to connect them

5 Another Way to Connect Internet Connection Sharing g( (ICS)

6 Yet another way to network Why??? ----

7 My Recommended Home Network Layout

8 Benefits of a Home Network Share Internet Access (2 or more PC s) Share devices (printers, webcams, scanners, CD & DVD drives, etc. Share or exchange files and data storage Backup other computer s data Others

9 Typical Home Networks Wired (Ethernet) Two or More PC s Mixed PC Types (Mac, IBM, etc.) and Op Systems Wireless One or more computers Mixed PC Types and Op Systems Combination of Wired and Wireless One or more computers Mixed PC types and Op Systems

10 Essentials for Internet Access Sharing If you use my Recommended Layout and a Cable Modem, it should work out of the box. If you use a DSL Modem, you will have to program your Router with your account ID and Password so it can login The default settings provide you with Network Address Translation (NAT), DHCP, and usually implement minimal input or output filtering

11 Network Address Translation Share one Internet Address with several Local PC s

12 Typical Home Network NAT Or by DHCP of Router Router

13 Dynamic Host Configuration Protocol (DHCP) DHCP enables the residential gateway, 4-port Router or ICS to assign IP addresses to client computers automatically. By default, when a 4-port Router or ICS is installed, the DHCP service begins supplying addresses to computers on the network.

14 Essentials for Home Network Each computer must have a unique name Each computer must use the same Workgroup name Files and/or directories (folders) to be shared must be setup to be shared on the computer which hosts the file..each WIN xx does it a little differently Devices to be shared must be setup to be shared on the computer which hosts the device (e.g. printer)

15 File and Print Sharing Setup WIN XP use Network Setup Wizard WIN 2000, and others??? WIN 98se use Settings, Control Panel, Network, [Configuration, Identification and Access Control]

16 Accessing Your Other Computer s Files & Devices WIN XP Start, My Network Places, and select a file, directory, etc. WIN 98se Network Neighborhood, select ect Computer name and select ect shared files and directories

17 Recommended Wired Home Network Security

18 Why Wireless? Convenience no wires to run to PC s, Easy to install Flexibility full PC mobility throughout house & Laptops Cost (2 PC s) Under $50 for B (11Mb/sec) Under $100 for G (54 Mb/sec) Security Adequate if configured correctly (change SSID, Use WEP and now WPA)

19 Wireless Requirements (Minimum) m) Broadband Network Service (Cable / DSL) Cable/DSL Modem Wireless Network Adaptor for each remote PC/laptop Wireless Access Point ( usually USB connection for administration) OR WIN XP with ICS

20 Minimum m Wireless Setup

21 Typical Wireless Home Network

22 Common Types of Wireless A B (11Mbps - Most common) G (54Mbps - backwards compatible to B) SuperG and variants Oh Others Bluetooth

23 Network Speeds A prox R eal Transfer Times: Common Name Used With Time to Transfer 1 Megabyte Time to transfer 50 Megabytes 28.8Kbps Modems 6-12 Min Hrs 56.6Kbps Modems 3-6 Min Hrs 128Kbps ISDN 1-3 Min hrs 460Kbps Some Cable Modems Sec Min 1Mbps HomePNA 1.0**, Some Cable Modes Sec 8-16 Min 1.6Mbps HomeRF** 6-13 Sec 5-10 Min 10Mbps Ethernet, HomePNA 2.0** 1-2 Sec Sec 100Mbps Fast Ethernet 1 Sec 5-10 Sec* H ow fast is it (real world)? A full strength b signal will get you about Mbps without WEP enabled. With WEP enabled, expect Mbps. As you put walls and distance between your wireless adapter and your access point, your speed will drop. Don t expect to put more than a few walls between you and your access point.

24 Recommended Wireless Configuration 4 Port Wireless Router G (Combination of Wireless Access Point and 4 Port Router for Wired Connections) Provides Firewall Protections -- Address Translation (NAT), DHCP, VPN Passthrough, Content Filtering, Domain Blocking, Scheduling, WEP, and other security features.

25 Essential Wireless Hardware a 4-Port Router Front 4-Port Router Rear USB Wireless Adaptor PCI Wireless Card USB Wireless Adaptor

26 My Recommended Home Network Layout

27 An Example of 4-Port Wireless Router

28 Wireless Security Concernsns Broadcast of your data for others to see Provide Internet Service to others in your neighborhood Access to your network and computers by outsiders thru your Wireless Access Point which is behind your Router (Firewall) Other???

29 What can be done to Secure your Wireless Home Network Use a Wireless Router instead of just a Wireless Access Point Change the default SSID Disable Broadcast of the SSID Use 128 Bit or higher WEP encryption Use WPA encryption if available

30 Wireless Router Configuration READ THE MANUAL Router Usually accessed using your Browser (Internet Explorer, Netscape, etc.) Use address of with Browser (usual default addr. for Router) Or Telnet at a cmd prompt

31 Sample Router Login

32 Router Configuration (cont. 2) Enter your default userid and password My Netgear uses admin for the default userid and 1234 for the default password Use the Setup Wizard if it is available Follow the menu to change the userid and password Follow the menu to change the SSID and to enable WEP encryption and/or WPA

33 Sample Router Main Menu

34 Router Configuration (Cont. 3) Remember that you must change each Wireless PC to match the SSID and the WEP Encryption when you change them at the Router. I suggest you not change any of the defaults until you have at least one wireless PC working with the defaults.

35 Sample Router Wireless Configuration Screen XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX ######################## Use your own SSID and WEP Key

36 Sample Wireless Router DHCP Note my choice of range

37 Common Wireless Brands Linksys Netgear Dlink Belkin Microsoft others

38 Wireless Home Network Links homenethelp dex.asp asp html

39 Questions?