IP Network Layer and Ethernet Encapsulation

1
IP Network Layer and Ethernet Encapsulation

• Lab exercises

2
IP addresses

• Host IP address
• 193.225.201.130-146
• Network address
• 193.225.201.128/27
• Netmask 32 addresses
• 255.255.255.x
• Broadcast address
• 193.225.201.x
• Gateway
• 193.225.201.129

3
Class diagram
.133
.134
.132
.131
eth0
eth0
eth0
eth0
.141
.142
.140
.139
eth0
eth0
eth0
eth0
.135
PC4
PC3
PC1
PC2
PC10
PC12
eth1
PC9
PC11
Row 2
Row 6
Row 5
Row 1
.138
.137
.135
.136
.146
.145
.143
.144
eth0
eth0
eth0
eth0
eth0
eth0
eth0
eth0
PC7
PC6
PC5
PC8
PC14
PC13
PC15
PC16
Row 7
Row 8
Row 4
Row 3
193.225.201.128/27
4
Windows Settings- Exercise 1

• Install Ethernet drivers and TCP/IP
• Control Panel -gt Network -gt TCP/IP (Ethernet)
• IP address
• Netmask
• Gateway
• DNS
• MS-DOS prompt
• ping ip-address
• tracert ip-address

5
Ping - Exercise 2

• Step 1
• Load Ethernet Driver
• modprobe eth0
• Check if driver is loaded
• lsmod
• see if module loaded (3c509)

6
Ping - Exercise 2 (cont.)

• Configure Ethernet Interface
• ifconfig eth0 ltIP addressgt netmask ltnetmaskgt
  broadcast ltbroadcastgt
• For Linux lt 2.2
• route add -net ltnetworkgt netmask ltnetmaskgt
• Check
• ifconfig - check interface
• netstat -nr - check route to network

7
Ping - Exercise 2 (cont.)

• Ping check status of host
• ping ltremote IP addressgt
• Try
• other machines
• broadcast address
• Add default route
• default is keyword 0.0.0.0
• route add default gw (IP address) metric N
• Traceroute check route to host
• traceroute (IP address)

8
Ping - Exercise 3

• Step 1
• Find your own MAC address
• ifconfig
• Step 2
• Ping your neighbor
• ping ltIP addressgt
• Step 3
• Show ARP cache look for their MAC addresses
• arp -n

9
Ping - Exercise 2 (cont.)

• Step 4
• On other window (e.g. ALTF2)
• Look for ARP frames
• arp -d ltIP addressgt - Flash ARP entry
• ping ltIP addressgt
• Go back to the first window to look for ARP frames