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Configuring your Home Wireless Network Presented by Lou Koch March 14, 2006 Adapted from Presentation at APCUG By Jay Ferron ADMT, CISM, CISSP, MCDBA, MCSE, MCT, NSA-IAM Questions How many of you have more than one computer at home?

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Configuring your Home Wireless Network

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configuring your home wireless network

Configuring your Home Wireless Network

Presented by Lou Koch

March 14, 2006

Adapted from Presentation at APCUG

By Jay Ferron


  • How many of you have more than one computer at home?
  • How many of you connect to the Internet using broadband (Cable or DSL)
  • How many already have a home router?
  • Already have a wireless router?

For those who have not already done so, we will show you how to install a WLAN tonight.

More critically we will discuss ways to secure your wireless network

  • Connecting things together
  • Home network - terminology
  • Security – Firewalls, Filtering, etc
  • Setting up a home router
  • Setting up Print and File Sharing
  • Questions
home network
Home Network
  • Internet – ISP
    • Wire to home
  • Modem
    • Translates electronic data
  • Router
    • Disperses electronic data
  • Network Adaptor
    • Required for each Computer
    • Wired
      • NIC (network interface card) or ethernet card
    • Wireless
      • Wireless Adaptor
network one or more devices connected together
NetworkOne or more devices connected together
  • To the Internet with a router
  • To each other in order to share Resources:
      • Internet Connections
      • Sharing Files
      • Sharing Printers
      • WAN – Wide Area Network … many computers, locations
      • LAN – Local Area Network … few computers, 1 location
      • PAN – Personal Area Network … home network
      • WLAN – Wireless Local Area Network
  • Wireless Networking Standards
    • 802.11 a, b, and g
      • configuration specifications to insure compatibility
      • Different speed/range capabilities
    • Equipment conforming to “g” is most popular/available
      • Good for 100-400 feet … in a house
    • General rule – don’t mix equipment made to different standards
  • Bluetooth
    • Standard which is often used for peripheral devices
      • Printers, scanners, cell phones, etc
      • Short range (10 ft), high speed
what is a cable dsl modem
What is a Cable/DSL Modem
  • Modem (modulator/demodulator)
    • encodes/decodes information transmitted to the internet
  • Usually provided and controlled by your ISP
  • Connects your home to the Internet.
  • This is the device that gets your public IP (internet protocol) address
  • Normally has no firewall protection
what is a router
What is a Router
  • Connects one network to another … Sometimes called a “Gateway”
  • Connects your computer to the internet (cable modem or DSL Line) – keeps LAN traffic local
  • Routers keep track of IP addresses and physical (MAC) addresses of hosts
    • IP (Internet Protocol) address … your computers internet address
    • MAC (Media Access Control) … id for each physical communication device
what is an access point
What is an Access Point
  • A point where computers access a network
    • Device which links wireless users to network
    • Transmits and receives data (Transceiver)
    • Bridge between wireless and wired networks
  • Can be linked together to cover broad area
  • No security or firewall implemented
what is a firewall
What is a Firewall
  • A device that filters packets of data or traffic
  • Its job is to be a traffic cop
  • You configure the firewall:
    • What will allow to pass
    • What will it block
  • Hides your home network from the outside world
  • Can be either in hardware or software
  • Most popular routers for home have built in firewall protection
what does a firewall do
What Does a Firewall do?


  • Protect your home computer from the bad guys
  • Keep your information private
  • Make you less of a target


  • Stopping viruses
  • Hiding your computer from the world
  • Making the bad guys work harder to get your info
firewall protection



Home Network

Firewall Protection
  • Checks incoming traffic from the network before it gets to your home network …. default – Blocks all Incoming connections
  • Traffic leaving your home network … default - Allow all outbound connections
  • Hardware firewalls protect you home network by stop all traffic before it get to your computers
  • Personal software firewall on your computer blocks incoming and outgoing (lets you know what is leaving your computer)
hardware firewall routers
HardwareFirewall Routers

The idea is layers of protection

  • Examples of home combo units include
    • Belkin(we will demo tonight)
    • Dlink
    • Linksys
    • Netgear
software firewalls
Software Firewalls
  • Adding a second level of protection
  • Controlling what leaves your computer
  • By being aware of application level attacks
  • By allow you to schedule
    • Usage of the internet by time (control access at night)
    • By location (block content for young children)
software firewalls for home use
Software Firewalls for Home Use
  • Examples
    • Zone Alarm (Free)
    • McAfee Firewall
    • Symantec’s Norton Personal Firewall
    • Computer Associates with Firewall (free)
    • Windows Firewall in XP Service Pack 2 (free)
configure wireless firewall router overview
Configure Wireless Firewall/router Overview
  • Basic Settings … name, ip address, etc

Check for firmware updates

  • Set Account name and password

Change name and password … don’t used default

  • Wireless Settings

SSID broadcast …

make sure that remote computers are set to automatically connect

Do not enable DMZ

Do enable ping blocking

  • Security - Blocking and Filtering

Wireless Security encryption

MAC filtering

  • Back up settings
basic settings and info
Basic Settings and Info
  • Run Install CD that comes with router
    • Basic info will be automatically entered or requested
  • To change info:
    • For Belkin the default IP address is
      • Other manufacturers use different ip addresses (later slide)
    • Enter this into address bar
    • Setup page will be displayed
  • Firmware - software that is embedded in a hardware device
    • Updated occasionally by manufactures
    • Check whenever you access router
account name
Account Name
  • Change name
    • Default name is set by manufacturer … eg, Belkin54
    • Bad guys know defaults and default administrative passwords
  • Create Administrative Password
    • Use Strong Password
  • Record your password where you can find it so you can make changes
default info
Default Info
  • Router default info is easily available on internet for consumers … and the bad guys
    • eg
  • So Change Name and Password

Your computer password is the foundation of your computer security

  • No Password = No Security
  • Old Passwords & Same Password = Reduced Security
  • Set and change the “administrator” password on router (and your computer logon)
  • STRONG PASSWORD … 6-8 digit passwords
    • use upper, lower case, numbers and symbols
wireless settings
Wireless Settings
  • SSID - service set identifier
    • name given to your wireless network
    • Broadcasting this ID makes network visible to PCs in area
      • can be turned off so it will not be detected by other PCs in area
      • Be sure to set up your own pc to automatically detect and logon to your WLAN
  • DMZ –
    • allows you to select a PC to access WLAN outside the firewall
    • do not enable unless firewall interferes with some activity
  • Ping Blocking –troubleshooting tool
    • Signal sent and echo received indicates valid ip address
    • Used by hackers to find active computers
    • Enable ping blocking … won’t send echo back
security blocking and filtering
SecurityBlocking and Filtering
  • Encryption – coding transmissions
    • Multiple variations. 2 most common:
  • WPA-PSK … Wireless Protected Access (Pre-shared key)
    • Use same password for all computers
    • Preferred Choice
  • WEP … Wired equivalent privacy
    • 64 or 128 bit encryption … doesn’t matter
    • Enter Password … converts to hex code
      • Must enter hex code
    • 2nd Choice (if WPA not supported)
mac filtering
MAC Filtering
  • MAC address … Media Access Control address
    • Unique ID permanently attached to each communication device by manufacturer – hardware id
    • Can find MAC address: run  cmd  ipconfig/all
  • Enter MAC addresses of acceptable network clients
    • If address is not on filter list, access to network will be denied
  • Very effective security method
recap steps to protect your wireless network
RECAPSteps to protect your wireless network
  • Change the default password on your router
  • 2. Enable WPA(PSK) or WEP on router and wireless workstation
  • Use MAC address filtering
  • SSID broadcast off
  • Prohibit Peer-to-peer (Ad Hoc) networking
  • 5. Keep current on hardware bios upgrades
print and file sharing overview
Print and File SharingOverview
  • Print and File Sharing:
    • Useful, but Risky if all computers are not secure
  • Setting up Network for Printer and File sharing
    • Interface card
      • Set Interface card to allow
    • Each computer in network
      • Make sure each computer is part of network
    • Printer
      • Make sure that Print sharing is allowed for printer
      • Load appropriate print drivers on each computer
    • Firewall Settings
      • Reset network IP range to trusted zone
    • Place files to share in “Shared Documents” folder
print and file sharing details 1
Print and File SharingDetails (1)
  • Be sure WLAN is working and secure
  • Interface card
    • Start  connect to  NIC or WLAN card  properties
      • Check “File and Printer sharing on Microsoft Networks”
      • Repeat for all PCs on Network
  • Printer
    • Start  Printers and Faxes  shared printer
      • Select properties  sharing  check “share this Printer)
print and file sharing details 2
Print and File SharingDetails (2)
  • Firewall
    • Be sure WLAN IPs are allowed in Firewall for all PCs
    • Zone Alarm
      •  Firewall  zones  add  IP range  <enter appropriate range>
  • Network ID for each computer
    • Under My Computer  Properties  Computer name
      • Click Change and add WLAN name as Workgroup
  • Shared Documents Folder for each computer
    • Any files in the Shared Documents folder will be accessible from all computers