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Address Resolution Protocol
(ARP)
Chapter 8
Static Mapping
Involves list of logical and physical addresses
Maintenance of list requires high overhead
Dynamic Mapping
Finds physical address given logical address
Address Resolution Protocol (ARP)
Address Mapping
2
Position of ARP in TCP/IP Protocol Suite
3
broadcast
ARP Operation
4
ARP Packet
5
Encapsulation of ARP Packet
DataPreambleand SFD
Destinationaddress
Sourceaddress
Type CRC
8 bytes 6 bytes 6 bytes 2 bytes 4 bytes
Type: 0x0806
6
Example of ARP Request and Reply
7
Four Cases using ARP
8
Proxy ARP
Request
9
Most recent address mappings are kept in cache table
Mappings in cache table have time-to-live and updated periodically
ARP Cache Table
10
ARP Cache Table
11
ARP Components
12
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