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8.5.1 - Lab - Configure DHCPv6

Topology

Addressing Table

Device		Interface	IPv6 Address
R1	G0/0/0		2001:db8:acad:2::1 /64
R1	G0/0/0		fe80::1
R1	G0/0/1		2001:db8:acad:1::1/64
R1	G0/0/1		fe80::1
R2	G0/0/0		2001:db8:acad:2::2/64
R2	G0/0/0		fe80::2
R2	G0/0/1		2001:db8:acad:3::1 /64
R2	G0/0/1		fe80::1
PC-A	NIC		DHCP
PC-B	NIC		DHCP

Objectives

Part 1: Build the Network and Configure Basic Device Settings

Part 2: Verify SLAAC address assignment from R1

Part 3: Configure and verify a Stateless DHCPv6 Server on R1

Part 4: Configure and verify a Stateful DHCPv6 Server on R1 Part 5: Configure and verify a DHCPv6 Relay on R2

Background / Scenario

The dynamic assignment of IPv6 global unicast addresses (GUA) can be configured the following three ways:

• Stateless Address Auoconfiguration (SLACC)
• Stateless Dynamic Host Configuration Protocol for IPv6 (DHCPv6)
• Stateful DHCPv6

When using SLACC to assign IPv6 addresses to hosts a DHCPv6 server is not used. Because a DHCPv6 server is not used when implementing SLACC, hosts are unable to receive additional critical network information, including a domain name server (DNS) address as well as a domain name.

When using Stateless DHCPv6 to assign IPv6 addresses to host, a DHCPv6 server is used to assign the additional critical network information, however the IPv6 address is assigned using SLACC.

When implementing Stateful DHCPv6, a DHCPv6 server assigns all network information, including the IPv6 address.

The determination of how hosts obtain they dynamic IPv6 addressing is dependent on flag setting contain within the router advertisement (RA) messages.

In this scenario, the company has grown in size, and the network administrators can no longer assign IP addresses to devices manually. Your job is to configure the R2 router to assign IPv6 addresses on two different subnets connected to router R1.

Note: The routers used with CCNA hands-on labs are Cisco 4221 with Cisco IOS XE Release 16.9.4

(universalk9 image). The switches used in the labs are Cisco Catalyst 2960s with Cisco IOS Release 15.2(2) (lanbasek9 image). Other routers, switches, and Cisco IOS versions can be used. Depending on the model and Cisco IOS version, the commands available and the output produced might vary from what is shown in the labs. Refer to the Router Interface Summary Table at the end of the lab for the correct interface identifiers.

Note: Ensure that the routers and switches have been erased and have no startup configurations. If you are unsure contact your instructor.

Required Resources

• 2 Routers (Cisco 4221 with Cisco IOS XE Release 16.9.4 universal image or comparable)
• 2 Switches (Cisco 2960 with Cisco IOS Release 15.2(2) lanbasek9 image or comparable) - Optional
• 2 PCs (Windows with a terminal emulation program, such as Tera Term)
• Console cables to configure the Cisco IOS devices via the console ports
• Ethernet cables as shown in the topology

Instructions Part 1: Build the Network and Configure Basic Device Settings

In Part 1, you will set up the network topology and configure basic settings on the PC hosts and switches.

Step 1: Cable the network as shown in the topology.

Attach the devices as shown in the topology diagram, and cable as necessary. Step 2: Configure basic settings for each switch. (Optional)

Open configuration window

1. Assign a device name to the switch.
2. Disable DNS lookup to prevent the router from attempting to translate incorrectly entered commands as though they were host names.
3. Assign class as the privileged EXEC encrypted password.
4. Assign cisco as the console password and enable login.
5. Assign cisco as the VTY password and enable login.
6. Encrypt the plaintext passwords.
7. Create a banner that warns anyone accessing the device that unauthorized access is prohibited. h. Shutdown all unused ports

       i.    Save the running configuration to the startup configuration file.

Close configuration window Step 3: Configure basic settings for each router.

Open configuration window

1. Assign a device name to the router.
2. Disable DNS lookup to prevent the router from attempting to translate incorrectly entered commands as though they were host names.
3. Assign class as the privileged EXEC encrypted password.
4. Assign cisco as the console password and enable login.
5. Assign cisco as the VTY password and enable login.
6. Encrypt the plaintext passwords.
7. Create a banner that warns anyone accessing the device that unauthorized access is prohibited. h. Enable IPv6 Routing

       i.    Save the running configuration to the startup configuration file.

Step 4: Configure interfaces and routing for both routers.

1. Configure the G0/0/0 and G0/0/1 interfaces on R1 and R2 with the IPv6 addresses specified in the table above.
2. Configure a default route on each router pointed to the IP address of G0/0/0 on the other router.
3. Verify routing is working by pinging R2’s G0/0/1 address from R1
4. Save the running configuration to the startup configuration file.

Close configuration window

Part 2: Verify SLAAC Address Assignment from R1

In Part 2, you will verify that Host PC-A receives an IPv6 address using the SLAAC method.

Power PC-A up and ensure that the NIC is configured for IPv6 automatic configuration.

After a few moments, the results of the command ipconfig should show that PC-A has assigned itself an address from the 2001:db8:1::/64 network.

C:\Users\Student> ipconfig

Windows IP Configuration

 

Ethernet adapter Ethernet 2:

 

   Connection-specific DNS Suffix  . : 

   IPv6 Address. . . . . . . . . . . : 2001:db8:acad:1:5c43:ee7c:2959:da68

   Temporary IPv6 Address. . . . . . : 2001:db8:acad:1:3c64:e4f9:46e1:1f23

   Link-local IPv6 Address . . . . . : fe80::5c43:ee7c:2959:da68%6

   IPv4 Address. . . . . . . . . . . : 169.254.218.104

   Subnet Mask . . . . . . . . . . . : 255.255.0.0

   Default Gateway . . . . . . . . . : fe80::1%6

Question:

Where did the host-id portion of the address come from?

Type your answers here.

Part 3: Configure and Verify a DHCPv6 server on R1

In Part 3, you will configure and verify a stateless DHCP server on R1. The objective is to provide PC-A with DNS server and Domain information.

Step 1: Examine the configuration of PC-A in more detail.

a. Issue the command ipconfig /all on PC-A and take a look at the output.

C:\Users\Student> ipconfig /all

Windows IP Configuration

 

   Host Name . . . . . . . . . . . . : DESKTOP-3FR7RKA    Primary Dns Suffix  . . . . . . . : 

   Node Type . . . . . . . . . . . . : Hybrid

   IP Routing Enabled. . . . . . . . : No

   WINS Proxy Enabled. . . . . . . . : No

 

Ethernet adapter Ethernet0:

 

   Connection-specific DNS Suffix  . : 

   Description . . . . . . . . . . . : Intel(R) 852574L Gigabit Network Connection

   Physical Address. . . . . . . . . : 00-50-56-83-63-6D

   IPv6 Address. . . . . . . . . . . : 2001:db8:acad:1:5c43:ee7c:2959:da68(Preferred)

   Temporary IPv6 Address. . . . . . : 2001:db8:acad:1:3c64:e4f9:46e1:1f23(Preferred)

   Link-local IPv6 Address . . . . . : fe80::5c43:ee7c:2959:da68%6(Preferred)

   IPv4 Address. . . . . . . . . . . : 169.254.218.104(Preferred)

   Subnet Mask . . . . . . . . . . . : 255.255.0.0

   Default Gateway . . . . . . . . . : fe80::1%6

   DHCPv6 IAID . . . . . . . . . . . : 50334761

   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-24-F5-CE-A2-00-50-56-B3-63-6D    DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1                                        fec0:0:0:ffff::2%1                                        fec0:0:0:ffff::3%1

   NetBIOS over Tcpip. . . . . . . . : Enabled

b. Notice that there is no Primary DNS suffix. Also note that the DNS server addresses provided are “site local anycast” addresses, and not unicast addresses, as would be expected.

Step 2: Configure R1 to provide stateless DHCPv6 for PC-A.

1. Create an IPv6 DHCP pool on R1 named R1-STATELESS. As a part of that pool, assign the DNS server address as 2001:db8:acad::1 and the domain name as stateless.com.

Open configuration window

R1(config)# ipv6 dhcp pool R1-STATELESS

R1(config-dhcp)# dns-server 2001:db8:acad::254

R1(config-dhcp)# domain-name STATELESS.com

2. Configure the G0/0/1 interface on R1 to provide the OTHER config flag to the R1 LAN, and specify the DHCP pool you just created as the DHCP resource for this interface.

R1(config)# interface g0/0/1

R1(config-if)# ipv6 nd other-config-flag

R1(config-if)# ipv6 dhcp server R1-STATELESS

3. Save the running configuration to the startup configuration file.

Close configuration window

4. Restart PC-A.
5. Examine the output of ipconfig /all and notice the changes.

C:\Users\Student> ipconfig /all

Windows IP Configuration

 

   Host Name . . . . . . . . . . . . : DESKTOP-3FR7RKA    Primary Dns Suffix  . . . . . . . : 

   Node Type . . . . . . . . . . . . : Hybrid

   IP Routing Enabled. . . . . . . . : No

   WINS Proxy Enabled. . . . . . . . : No

   DNS Suffix Search List. . . . . . : STATELESS.com

 

Ethernet adapter Ethernet0:

 

   Connection-specific DNS Suffix  . : STATELESS.com

   Description . . . . . . . . . . . : Intel(R) 82574L Gigabit Network Connection

   Physical Address. . . . . . . . . : 00-50-56-83-63-6D

   DHCP Enabled. . . . . . . . . . . : Yes

   Autoconfiguration Enabled . . . . : Yes

   IPv6 Address. . . . . . . . . . . : 2001:db8:acad:1:5c43:ee7c:2959:da68(Preferred)

   Temporary IPv6 Address. . . . . . : 2001:db8:acad:1:3c64:e4f9:46e1:1f23(Preferred)

   Link-local IPv6 Address . . . . . : fe80::5c43:ee7c:2959:da68%6(Preferred)

   IPv4 Address. . . . . . . . . . . : 169.254.218.104(Preferred)

   Subnet Mask . . . . . . . . . . . : 255.255.0.0

   Default Gateway . . . . . . . . . : fe80::1%6

   DHCPv6 IAID . . . . . . . . . . . : 50334761

   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-24-F5-CE-A2-00-50-56-B3-63-6D

   DNS Servers . . . . . . . . . . . : 2001:db8:acad::254

   NetBIOS over Tcpip. . . . . . . . : Enabled

   Connection-specific DNS Suffix Search List :

                                       STATELESS.com

       f.    Test connectivity by pinging R2’s G0/0/1 interface IP address.

Part 4: Configure a stateful DHCPv6 server on R1

In Part 4, you will configure R1 to respond to DHCPv6 requests from the LAN on R2.

1. Create a DHCPv6 pool on R1 for the 2001:db8:acad:3:aaaa::/80 network. This will provide addresses to the LAN connected to interface G0/0/1 on R2. As a part of the pool, set the DNS server to 2001:db8:acad::254, and set the domain name to STATEFUL.com.

Open configuration window

R1(config)# ipv6 dhcp pool R2-STATEFUL

R1(config-dhcp)# address prefix 2001:db8:acad:3:aaa::/80

R1(config-dhcp)# dns-server 2001:db8:acad::254

R1(config-dhcp)# domain-name STATEFUL.com

2. Assign the DHCPv6 pool you just created to interface g0/0/0 on R1.

R1(config)# interface g0/0/0

R1(config-if)# ipv6 dhcp server R2-STATEFUL

Close configuration window

Part 5: Configure and verify DHCPv6 relay on R2.

In Part 5, you will configure and verify DHCPv6 relay on R2, allowing PC-B to receive an IPv6 Address.

Step 1: Power on PC-B and examine the SLAAC address that it generates.

C:\Users\Student> ipconfig /all Windows IP Configuration

 

   Host Name . . . . . . . . . . . . : DESKTOP-3FR7RKA    Primary Dns Suffix  . . . . . . . : 

   Node Type . . . . . . . . . . . . : Hybrid

   IP Routing Enabled. . . . . . . . : No

   WINS Proxy Enabled. . . . . . . . : No

 

Ethernet adapter Ethernet0:

 

   Connection-specific DNS Suffix  . : 

   Description . . . . . . . . . . . : Intel(R) 82574L Gigabit Network Connection

   Physical Address. . . . . . . . . : 00-50-56-B3-7B-06

   DHCP Enabled. . . . . . . . . . . : Yes

   Autoconfiguration Enabled . . . . : Yes

   IPv6 Address. . . . . . . . . . . : 2001:db8:acad:3:a0f3:3d39:f9fb:a020(Preferred)

   Temporary IPv6 Address. . . . . . : 2001:db8:acad:3:d4f3:7b16:eeee:b2b5(Preferred)

   Link-local IPv6 Address . . . . . : fe80::a0f3:3d39:f9fb:a020%6(Preferred)

   IPv4 Address. . . . . . . . . . . : 169.254.160.32(Preferred)

   Subnet Mask . . . . . . . . . . . : 255.255.0.0

   Default Gateway . . . . . . . . . : fe80::1%6

   DHCPv6 IAID . . . . . . . . . . . : 50334761

   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-24-F2-08-38-00-50-56-B3-7B-06    DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1                                        fec0:0:0:ffff::2%1                                        fec0:0:0:ffff::3%1    NetBIOS over Tcpip. . . . . . . . : Enabled

Notice in the output that the prefix used is 2001:db8:acad:3::

Step 2: Configure R2 as a DHCP relay agent for the LAN on G0/0/1.

1. Configure the ipv6 dhcp relay command on R2 interface G0/0/1, specifying the destination address of the G0/0/0 interface on R1. Also configure the managed-config-flag command.

Open configuration window

R2(config)# interface g0/0/1

R2(config-if)# ipv6 nd managed-config-flag

R2(config-if)# ipv6 dhcp relay destination 2001:db8:acad:2::1 g0/0/0 b. Save your configuration.

Close configuration window

Step 3: Attempt to acquire an IPv6 address from DHCPv6 on PC-B. a. Restart PC-B.

2. Open a command prompt on PC-B and issue the command ipconfig /all and examine the output to see the results of the DHCPv6 relay operation.

C:\Users\Student> ipconfig /all

Windows IP Configuration

 

   Host Name . . . . . . . . . . . . : DESKTOP-3FR7RKA    Primary Dns Suffix  . . . . . . . : 

   Node Type . . . . . . . . . . . . : Hybrid

   IP Routing Enabled. . . . . . . . : No

   WINS Proxy Enabled. . . . . . . . : No

   DNS Suffix Search List. . . . . . : STATEFUL.com

 

Ethernet adapter Ethernet0:

 

   Connection-specific DNS Suffix  . : STATEFUL.com

   Description . . . . . . . . . . . : Intel(R) 852574L Gigabit Network Connection

   Physical Address. . . . . . . . . : 00-50-56-B3-7B-06

   DHCP Enabled. . . . . . . . . . . : Yes

   Autoconfiguration Enabled . . . . : Yes

   IPv6 Address. . . . . . . . . . . : 2001:db8:acad3:aaaa:7104:8b7d:5402(Preferred)

   Lease Obtained. . . . . . . . . . : Sunday, October 6, 2019 3:27:13 PM

   Lease Expires . . . . . . . . . . : Tuesday, October 8, 2019 3:27:13 PM

   Link-local IPv6 Address . . . . . : fe80::a0f3:3d39:f9fb:a020%6(Preferred)

   IPv4 Address. . . . . . . . . . . : 169.254.160.32(Preferred)

   Subnet Mask . . . . . . . . . . . : 255.255.0.0

   Default Gateway . . . . . . . . . : fe80::2%6

   DHCPv6 IAID . . . . . . . . . . . : 50334761    DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-24-F2-08-38-00-50-56-B3-7B-06

   DNS Servers . . . . . . . . . . . : 2001:db8:acad::254

   NetBIOS over Tcpip. . . . . . . . : Enabled

   Connection-specific DNS Suffix Search List  :

                                       STATEFUL.com

c. Test connectivity by pinging R1’s G0/0/1 interface IP address.

End of document