Guide to TCP/IP: IPv6 and IPv4, Fifth Edition
ISBN 978-1-305-94695-8
Chapter 7 Solutions
Answers to Review Questions
1. False
3. a, c
5. a, c, f
7. d
9. True
11. d
13. a, b
15. a, b
17. d
19. d
21. c
Hands-On Projects Discussion
Hands-On Project 7-1
In this project, students open and examine the ch07_Hands-on_Project_trace_file_DHCPboot.pcapng trace
file that shows a basic DHCP boot sequence that includes Discovery, Offer, Request, and Acknowledgment
packets.
The following are answers to the questions about Packet #1:
3a. What value is contained in the Client Identifier field?
3b. How can you verify that the Client Identifier value is the same as the client’s hardware address?
3c. What is the host name?
3d. Can this client accept unicast replies during the boot process?
3e. List the option codes (and their names) used in this DHCP packet:
53: DHCP Message Type
Guide to TCP/IP: IPv6 and IPv4, Fifth Edition
ISBN 978-1-305-94695-8
3: Router
It is interesting to note that there are several ARP packets in this trace file. Packets #2 and #3 are sent by
Packet #8 is the DHCP client’s duplicate IP address test.
Hands-On Project 7-2
In this project, the students open the ch07_Hands-on_Project_trace_file_DHCPboot2.pcapng trace file,
which contains a client’s attempt to renew its address. As the client, 10.1.0.3, nears the end of its lease, we
see it move from the renewal process to the rebind process. In Packet #10, we see the client begin to
reinitialize.
The following are answers to the questions about Packet #3:
3a. Does this DHCP client already have an IP address?
3b.What message type is used in this packet?
3c. What is the purpose of this packet?
3d. Does the client receive a reply to this packet?
3e. What DHCP process is the client performing at this time?
The following are answers to the questions about Packet #5:
4a. Does this DHCP client still have an IP address?
4b. What is the message type used in this packet?
4c. What is the primary difference between this packet and Packet #3?
This packet is sent to the broadcast address.
4d. Does the client receive a reply to this packet?
Guide to TCP/IP: IPv6 and IPv4, Fifth Edition
ISBN 978-1-305-94695-8
4e. What DHCP process is the client performing at this time?
The following are answers to the questions about Packet #10:
5a. Does this DHCP client still have an IP address?
5b. What is the message type used in this packet?
The client uses a Discover request.
5c. Does the client receive a reply to this packet?
5d. What DHCP process is the client performing at this time?
6. Examine the remaining DHCP packets in the trace file. Did the client get the requested IP address?
Hands-On Project 7-3
In this project which mirrors Hands-On Project 7-1, but for IPv6/DHCPv6. Students open and examine the
ch07_Hands-on_Project_trace_file_DHCPv6boot.pcapng trace file that shows a basic DHCPv6 boot
sequence that includes DHCPv6 Solicit, Advertise, Request, and Reply packets.
The following are answers to the questions about Packet #4:
3a. Does this DHCPv6 client have an IPv6 global unicast address?
3b.What message type is used in this packet?
3c. What is the host name? (Hint: Look for domain.)
3d. Does the client receive a reply to this packet?
3e. What DHCPv6 process is the client performing at this time?
The following is the answer to the question about Step #4:
4. What is the packet number where the DHCPv6 provides the final approval for an IPv6 address, and what
is that IPv6 address assigned to the client?
The following is the answer to the question about Step #5:
5. Which packet is the DAD verification process for the client’s global unicast address?
Guide to TCP/IP: IPv6 and IPv4, Fifth Edition
ISBN 978-1-305-94695-8
Hands-On Project 7-4
In this project, the students view and manage DHCP and DHCPv6 lease information on a Windows
Case Projects Discussion
Case Project 7-1
This is a relatively simple (and common) design, and there are several solutions available:
1. Load DHCP relay agent software on the local bakery routers to forward all DHCP address
2. Install a DHCP server at each bakery. Although relatively simple, this solution may require
additional hardware and software. It could become an expensive option.
3. Install DHCP server software on the bakery routers. This is a very elegant solution. It does not
Case Project 7-2
This is a common problem on corporate networks—the nomad laptops brought into a company may contain
misconfigurations, poorly behaving applications, or even viruses. In this case, it appears that the well-
Case Project 7-3
It appears a trip to Vienna is necessary.
You’ll have to bring your analyzer and look at the DHCP boot sequence of the systems on the lower floor.
Most likely, you’ll see the clients send out DHCP Discovery broadcasts and they’ll be answered by the
Case Project 7-4
There are many potential parts of a network that need to be researched for IPv6 support, but we focus
mainly on the IPv6 address autoconfiguration of host devices. The key components to research in order to
support the IPv6 project are:
1. Depending on which DHCP design you chose last year, does that DHCP server also support
DHCPv6 services?
2. Another key component on the network is the router. Does the current router platform support
IPv6, in order for it to support IPv6 address autoconfiguration with a DHCPv6 platform?
3. Do all the host platforms support IPv6 address autoconfiguration?