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Dec 2012. IPv4 (Part III). ร ศ.ดร.อนันต์ ผลเพิ่ม Asso. Prof. Anan Phonphoem, Ph.D. anan.p@ku.ac.th http://www.cpe.ku.ac.th/~anan Computer Engineering Department Kasetsart University, Bangkok, Thailand. Outline. IP Fundamental Operation Internet Protocol Addressing Supporting Protocol

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ipv4 part iii

Dec 2012

IPv4 (Part III)

รศ.ดร.อนันต์ ผลเพิ่ม

Asso. Prof. Anan Phonphoem, Ph.D.

anan.p@ku.ac.th

http://www.cpe.ku.ac.th/~anan

Computer Engineering Department

Kasetsart University, Bangkok, Thailand

outline
Outline
  • IP Fundamental Operation
  • Internet Protocol
  • Addressing
  • Supporting Protocol
    • ARP
    • ICMP: ping + traceroute
    • NAT
    • DHCP
network address translation nat1
Network Address Translation (NAT)
  • Private Network
    • Good practice to use private address
  • Map local addresses to (real) public IP address(es)
  • Security (not expose internal details)
  • Alleviate IP depletion
stub network
Stub Network
  • Operates at the border of a stub network
stub network example adsl connection

Internet

ADSL Router

WLAN

ADSL Router

ADSL

Modem

Stub Network Example ADSL Connection

Telephone Line

ADSL

Modem

ISP

ADSL

Modem

slide8
NAT

“One” or “Pool” of IP addresses

example
Example

172.18.3.254

200.24.5.8

configure nat
Configure NAT
  • Static Translation
  • Dynamic Translation
dynamic translation
Dynamic Translation

Many-to-one Mapping ???

Many inside IP  one outside IP

slide14
PAT

179.9.8.80

disadvantages of nat
Disadvantages of NAT
  • Delay
  • Loss of end-to-end ability
  • Might not work with some applications

Find out what application does not work with NAT ?

bootp
BOOTP
  • Diskless terminal
  • Discover its own IP address
  • Download executable image file
  • Small program built in chip
    • BOOTH and TFTP
  • Application Protocol
    • Encapsulated in IP and UDP
slide21
DHCP
  • BOOTP Enhancement
  • Same message structure as BOOTP
  • Can choose among many DHCP servers
summary
Summary
  • IP Fundamental Operation
  • Internet Protocol
  • Addressing
  • Supporting Protocol
    • ARP
    • ICMP: ping + traceroute
    • NAT
    • DHCP