Address Resolution - PowerPoint PPT Presentation

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Address Resolution

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Title: ICSA412 Internetworking Lab Subject: Address Resolution Protocol Last modified by: Nirmala Shenoy Created Date: 6/17/1995 11:31:02 PM Document presentation format – PowerPoint PPT presentation

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Title: Address Resolution


1
Address Resolution
  • The process of mapping protocol addresses to
    hardware addresses
  • Only addresses on the same network as the host
    are resolved
  • Remote addresses are never resolved

2
Address Resolution
3
Address Resolution Techniques
  • Table Look up
  • Closed-Form Computation
  • Message Exchange

4
Address Resolution with Table Lookup
  • IP ADDRESS HARDWARE ADDRESS
  • 197.15.3.2 0A074B128236
  • 197.15.3.3 0A0823324C44
  • 197.15.3.4 0A0044245DEF
  • 197.15.3.5 0A328623E3C1

5
Address Resolution with Closed-Form Computation
  • Usually used where hardware addresses are
    configurable
  • Usually a simple formula is used to compute the
    last part of the hardware address from the host
    part of the Protocol address
  • ex. IP addr
  • 192.168.2.44 -gt 01-02-03-04-05-44

6
Address Resolution with Message Exchange
  • Distributed approach
  • Host send out a message with the request and
    receives back a reply
  • Two configurations server and individual

7
Address Resolution Protocol
  • Table lookup is usually used to resolve WAN
    addresses
  • Closed-form is used on configurable networks
  • Message exchange is used on LANs with static
    addressing
  • ARP is part of the TCP suite - standard
  • Two type messages defined request reply

8
ARP Message Format
9
Sending an ARP Message
10
ARP Packet Exchange
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