Layer 2 = 0800:0222:2222
Layer 3 = 192.168.3.1
Layer 2 = 0800:0222:1111
Layer 3 = 192.168.3.2
TCP: Hey application, here is some data.
SRC IP
192.168.3.1
SRC MAC
0800:0222:2222
DST MAC
0800:0222:1111
DST IP
192.168.3.2
TCP
SEQ = 3
APP
DATA
SRC IP
192.168.3.1
DST IP
192.168.3.2
TCP
SEQ = 3
APP
DATA
TCP
SEQ = 3
APP
DATA
APP
DATA
I need to send an ACK to the DATA that I received.
SRC IP
192.168.3.2
SRC MAC
0800:0222:1111
DST MAC
0800:0222:2222
DST IP
192.168.3.1
ACK = 4
SEQ = 3
SRC IP
192.168.3.2
SRC MAC
0800:0222:1111
DST MAC
0800:0222:2222
DST IP
192.168.3.1
ACK = 4
SEQ = 3
SRC IP
192.168.3.2
DST IP
192.168.3.1
ACK = 4
SEQ = 3
ACK = 4
SEQ = 3
Layer 3 = 192.168.3.1
Layer 2 = 0800:0222:2222
Layer 3 = 192.168.3.2
Layer 2 = 0800:0222:1111
Exploring the Packet Delivery Process 99
Figure 1-85 Role of the Default Gateway
Using Common Host Tools to Determine the Path Between Two Hosts
Across a Network
Ping is a computer network tool used to test whether a particular host is reachable across
an IP network. Ping works by sending Internet Control Message Protocol (ICMP) ???echo
request??? packets (???Ping????) to the target host and listening for ICMP ???echo response???
replies.
Pages:
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160