Figure 1-72 shows this operation.
Figure 1-72 ARP Responds
When host 192.168.3.1 receives the frame, it notes that the destination MAC address is the
same as its own address. It strips the Layer 2 encapsulation. Figure 1-73 shows this
operation.
Figure 1-73 Layer 2 Recognizes MAC Address
ARP: The ARP reply will say that I am
192.168.3.2 with a MAC of 0800:0222:1111.
ARP: Layer 2, send this using our MAC as the
SRC MAC and 0800:0222:222 as the DST MAC. ARP
Reply
ARP
Reply
SRC MAC
0800:0222:1111
DST MAC
0800:0222:2222
Packet
Parking Lot
Layer 3 = 192.168.3.1
Layer 2 = 0800:0222:2222
Layer 3 = 192.168.3.2
Layer 2 = 0800:0222:1111
Layer 2: It is sent.
Packet
Parking Lot
ARP
Reply
SRC MAC
0800:0222:1111
DST MAC
0800:0222:2222
Layer 3 = 192.168.3.1
Layer 2 = 0800:0222:2222
Layer 3 = 192.168.3.2
Layer 2 = 0800:0222:1111
Layer 2: I just got a frame with my MAC, so I??™ll process it.
The protocol ID indicates that it belongs to ARP.
Let me strip the Layer 2 header and send it to ARP.
ARP
Reply
SRC MAC
0800:0222:1111
DST MAC
0800:0222:2222
Layer 3 = 192.168.3.1
Layer 2 = 0800:0222:2222
Layer 3 = 192.168.3.2
Layer 2 = 0800:0222:1111
Packet
Parking Lot
94 Chapter 1: Building a Simple Network
The remaining ARP reply is passed to ARP.
Pages:
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155