Arp (address resolution protocol)
- 1. ARP (Address Resolution Protocol)5/20/20111
- 3. IntroductionARP is a protocol for mapping an logical address to an physical address.The logical addresses: 32-bit Internet addressPhysical address: 48-bit Ethernet addressWhy address resolution is necessary?5/20/20113
- 4. ARPARP (address resolution protocol)5/20/20114
- 6. The Format of ARP packet5/20/20116
- 7. Position of ARP in TCP/IP Protocol Suite5/20/20117
- 8. Encapsulation of ARP Packet Encapsulated directly into a data link frame ARP packet encapsulated in an Ethernet frame5/20/20118
- 9. Cases using ARPCase 2. A host wants to send a packet to another host on another network. It must first be delivered to the default router.5/20/20119
- 10. Cases using ARP (cont.)5/20/201110
- 11. ExampleMAC A.B.C.1.3.3MACff.ff.ff.ff.ff.ffIP197.15.22.33IP197.15.22.35What is your MAC Addr?197.15.22.33197.15.22.35197.15.22.34A.B.C.1.3.3A.B.C.7.3.5A.B.C.4.3.4ABC5/20/201111
- 12. Example (Cont.)MAC A.B.C.1.3.3MACff.ff.ff.ff.ff.ffIP197.15.22.33IP197.15.22.35What is your MAC Addr?197.15.22.33197.15.22.35197.15.22.34A.B.C.1.3.3A.B.C.7.3.5A.B.C.4.3.4ABCThat is my IP !5/20/201112
- 13. Example (Cont.)MAC A.B.C.7.3.5MACA.B.C.1.3.3IP197.15.22.35IP197.15.22.33I am the node you’re looking forThis is my MAC Addr197.15.22.33197.15.22.35197.15.22.34A.B.C.1.3.3A.B.C.7.3.5A.B.C.4.3.4ABC ARP Reply5/20/201113
- 14. Example (Cont.)MAC A.B.C.1.3.3MACA.B.C.7.3.5IP197.15.22.33IP197.15.22.35Data197.15.22.33197.15.22.35197.15.22.34A.B.C.1.3.3A.B.C.7.3.5A.B.C.4.3.4ABCARP Table:A.B.C.7.3.5 – 197.15.22.355/20/201114
- 15. SummaryARP is Address resolution protocol.ARP request and ARP reply.Format of ARP packet.Encapsulation of ARP packet.Cases using ARP.5/20/201115