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Transcript 
Internet Connections
Computer Pals for Seniors – The Hills
Peter Fowler
Two PCs Using Microsoft ICS
192.168.0.1
60.241.40.39
Ethernet
NAT
DHCP
Ethernet
NIC
Modem
NIC
Dial Up
ADSL
Cable
Wireless
Cross
Over
Cable
192.168.0.2
Microsoft
Internet
Connection
Sharing (ICS)
NIC
Ethernet (red)
Cat5 or Cat6
Ethernet (blue)
Cat5 or Cat6
October 2007 v1.1
Peter Fowler
2
Three PCs Using ICS + Hub
192.168.0.1
60.241.40.39
Ethernet
NAT
DHCP
NIC
Modem
NIC
Dial Up
ADSL
Cable
Wireless
192.168.0.2
Hub
192.168.0.3
NIC
NIC
Ethernet (blue)
Cat5 or Cat6
October 2007 v1.1
Peter Fowler
3
Three PCs Using Router
192.168.0.2
NIC
Dial Up
ADSL
Cable
Wireless
Modem
60.241.40.39
192.168.0.3
NAT DHCP
NIC
Router
192.168.0.4
192.168.0.1
October 2007 v1.1
NIC
Ethernet (blue)
Cat5 or Cat6
Peter Fowler
4
Three PCs + Router + Firewall
192.168.0.2
SPI
Firewall
Modem
NIC
Dial Up
ADSL
Cable
Wireless
60.241.40.39
192.168.0.3
NAT DHCP
NIC
Router
192.168.0.4
192.168.0.1
October 2007 v1.1
NIC
Ethernet (blue)
Cat5 or Cat6
Peter Fowler
5
Four PCs + Router + WAP
192.168.0.2
SPI
Firewall
Modem
NIC
Dial Up
ADSL
Cable
Wireless
60.241.40.39
192.168.0.3
WAP
NIC
SSID: network
WPA-PSK Security
Pass Key: xxxxx
Router
192.168.0.4
192.168.0.1
MAC Address
00:0f:b5:8b:af:93
October 2007 v1.1
NIC
192.168.0.5
Peter Fowler
6
Modem / Router / Firewall / WAP
192.168.0.2
NIC
Dial Up
ADSL
Cable
Wireless
Modem
60.241.40.39
192.168.0.3
WAP
NIC
Router
192.168.0.4
192.168.0.1
October 2007 v1.1
NIC
192.168.0.5
Peter Fowler
7
Internet Service Providers (ISP)
•
•
•
•
•
•
•
•
Provides high speed access to global Internet
Provides an Account with Username & Password
Allocates an IP address (dynamic or static)
Provides access to Domain Name Severs (DNS)
Provides a 5MB POP mailbox to hold your emails
Provides a Help Desk for when you have problems
Tracks your usage, issues bills and collects payment
May also offer Website Hosting & Spam Filtering etc
October 2007 v1.1
Peter Fowler
8
ISP Plan Parameters
• Technology
– Dial Up, ADSL, Cable or Wireless
• Speed
– 64kbps all the way up to 8,000kbps
• Download
– 200MB to 12GB per month
• Price
– $14 to $90 per month
October 2007 v1.1
Peter Fowler
9
Typical ISP Plans
Plan
Speed
BigPond Dial Up
64kbps/64kbps
50MB
$13.95
BigPond Dial Up
64kbps/64kbps
100MB
$19.95
BigPond ADSL
256kbps/64kbps
200MB
$29.95
BigPond ADSL
1,500kbps/256kbps
400MB
$49.95
BigPond ADSL
1,500kbps/256kbps
12GB
$79.95
BigPond Cable
8,000kbps/128kbps
200MB
$29.95
BigPond Cable
8,000kbps/128kbps
400MB
$49.95
BigPond Cable
8,000kbps/128kbps
12GB
$69.95
BigPond Wireless
<3,000kbps/<384kbps
1GB
$84.95
October 2007 v1.1
Download $ per Month
Peter Fowler
10
ISP Choice
• Limited by technology
– Cable only available from BigPond & Optus
– Wireless available from BigPond, Optus,
Virgin, Unwired, iBurst, Vodaphone, 3, Soul,
iRoam, Spin Internet and a few others
• Majority of the 236 ISPs support Dial Up
and ADSL
– Using Telstra’s CAN and Exchanges
October 2007 v1.1
Peter Fowler
11
Information Sources
• Whirlpool (http://bc.whirlpool.net.au/) is a
huge source of information on anything to
do with Internet connectivity
• Nearly 230,000 members Australia wide
• Details of ISPs, Plans, Modems
• Forums & Knowledge Base
October 2007 v1.1
Peter Fowler
12
Why Local Area Network (LAN)
•
•
•
•
•
•
Share an Internet connection
Share a printer to all users
Share files across all users
Share hard disk storage
Transfer information
Wireless mobility
October 2007 v1.1
Peter Fowler
13
Wireless Networks (Wi-Fi)
•
•
•
•
•
•
•
•
Use IEEE Standard 802.11
Indoor range below. Outdoors can be 3x
Data rates are theoretical – often much less
802.11a – 54Mbps / 35m range / 5GHz
802.11b – 11Mbps / 38m range / 2.4GHz
802.11g – 54Mbps / 38m range / 2.4GHz
802.11n – 248Mbps / 70m range / 2.4 & 5 GHz
802.11n standard to be finalised Sept 2008
October 2007 v1.1
Peter Fowler
14
Network Hardware
•
•
•
•
•
•
•
Modem
NIC
Hub
Switch
Router
WAP
Firewall
October 2007 v1.1
– Modulator / Demodulator
– Network Interface Card
– ‘Dumb’ Ethernet connector
– ‘Smart’ Ethernet connector
– Connects two Ethernet Networks
– Wireless Access Point
– ‘Border control’ for TCP/IP
Peter Fowler
15
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