IPv6 Tutorial

1 IPv6 Exercises

IPv6 Tutorial Exercises Students Manual October 16, 2006 IITC, Sri Lanka

2 IPv6 Exercises

Contents Exercise 1 : IPv6 Host Configuration

1.01 Introduction to IPv6 auto-configuration 1.02 Configuration

1.02.1 Microsoft Windows XP 1.02.2 Mac OS X 1.02.3 Linux

1.03 Verifying the configuration Exercise 2 : IPv6 Subnetting

2.01 Introduction IPv6 subnetting 2.02 Subnetting IPv6 2.03 Aggregating IPv6

Exercise 3 : IPv6 network topology

3.01 Identifying the segment 3.02 Distributing IPv6 address to each segment 3.03 Assigning IPv6 address to each networks devices

Exercise 4 : Configuring Router Interfaces with IPv6 4.01 Configuring router interfaces with IPv6 4.02 Verifying the IPv6 interface configuration 4.03 Creating a virtual IPv6 interface (Tunnel Interface) 4.04.1 Tunnel configuration 4.04.2 Verifying the Tunnel interface status Exercise 5 : Configuring IPv6 static route

5.01 Configuring IPv6 static route 5.02 Verifying IPv6 route

Exercise 6 : Configuring IPv6 dynamic routing (OSPF) 6.01 OSPF Basics(OSPFv3) 6.0.2 Configuring OSPF 6.02.1 OSPF Process configuration 6.02.2 OSPF Area configuration 6.02.3 OSPF Interface configuration Appendixes: Exercise 2 : Subnetting Answers

Exercise 3: Routers IPv4 Point-to-point addresses Routers IPv6 Point-to-point addresses

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Exercise 1 IPv6 Host Configuration The following configurations are based on each operating system. It contains the following sections: IPv6 host auto configuration with Microsoft, Mac OS X, Linux Step by step configuration Verifying the configuration

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About IPv6 Autoconfiguration In IPv4 dynamic configuration is thru the use of Dynamic Host Configuration Protocol (DHCP) which allows the host machine to obtain an IPv4 address which also includes information of the default routers, WINS for Windows and so the Domain Name Server (DNS) address if the DHCP is configured to issue such details once the host obtain the address. IPv6 has a similar protocol called DHCPv6, however IP6 also has a stateless autoconfiguration protocol (RFC2462) that doesnt require or rely on any DHCP server. Autoconfiguration requires no manual configuration from the host machine and with only little configuration to the routers. Step-by- step configurations for each operation system Microsoft Windows XP Source: http://www.microsoft.com/technet/itsolutions/network/ipv6/ipv6faq.mspx To install the IPv6 protocol for Windows XP with SP2, do the following: 1. Log on to the computer with a user account that has privileges to change network configuration. 2. Click Start, click Control Panel, and then double-click Network Connections. 3. Right-click any local area connection, and then click Properties. 4. Click Install. 5. In the Select Network Component Type, dialog box, click Protocol, and then click Add. 6. In the Select Network Protocol dialog box, click Microsoft TCP/IP version 6, and then click OK. 7. Click Close to save changes to your network connection. Alternately, from the Windows XP desktop, click Start, point to Programs, point to Accessories, and then click Command Prompt. At the command prompt, type netsh interface ipv6 install. For the IPv6 protocol for Windows XP with SP1, do the following: 1. Log on to the computer with a user account that has privileges to change network configuration. 2. Click Start, click Control Panel, and then double-click Network Connections. 3. Right-click any local area connection, and then click Properties. 4. Click Install.

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5. In the Select Network Component Type dialog box, click Protocol, and then click Add. 6. In the Select Network Protocol dialog box, click Microsoft IPv6 Developer Edition, and then click OK. 7. Click Close to save changes to your network connection. Alternately, from the Windows XP desktop, click Start, point to Programs, point to Accessories, and then click Command Prompt. At the command prompt, type netsh interface ipv6 install. To install the IPv6 protocol for Windows XP with no service packs installed: 1. Log on to the computer running Windows XP with a user account that has privileges to change network configuration. 2. Open a command prompt. From the Windows XP desktop, click Start, point to Programs, point to Accessories, and then click Command Prompt. 3. At the command prompt, type ipv6 install. Regardless of the version of Windows XP, to use RPC applications over IPv6, you must first restart the computer. Verifying your configuration For Windows Server 2003, Windows XP with SP2, and Windows XP with SP1, you can use the ipconfig command to view your IPv6 addresses. Here is an example: c:\>ipconfig Windows IP Configuration Ethernet adapter Ethernet: Connection-specific DNS Suffix . : wcoast.corp.example.com

IP Address. . . . . . . . . . . . : 157.54.139.57 Subnet Mask . . . . . . . . . . . : 255.255.252.0 IP Address. . . . . . . . . . . . : 2001:db8:8311:f282:1460:5260:c9b1:fda6 IP Address. . . . . . . . . . . . : 2001:db8:8311:f282:b973:4db8:97e2:e978 IP Address. . . . . . . . . . . . : 2001:db8:8311:f282:200:39ff:fe0e:fc35 IP Address. . . . . . . . . . . . : fec0::f282:200:39ff:fe0e:fc35%1 IP Address. . . . . . . . . . . . : fe80::200:39ff:fe0e:fc35%4

Default Gateway . . . . . . . . . : 157.54.136.1

fe80::210:ffff:fed6:58c0%4 Tunnel adapter 6to4 Tunneling Pseudo-Interface:

Connection-specific DNS Suffix . : wcoast.corp.example.com IP Address. . . . . . . . . . . . : 2002:9d3b:8b39::9d3b:8b39 Default Gateway . . . . . . . . . :

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Tunnel adapter Automatic Tunneling Pseudo-Interface: Connection-specific DNS Suffix . : wcoast.corp.example.com IP Address. . . . . . . . . . . . : fec0::f70f:0:5efe:157.54.139.57%1 IP Address. . . . . . . . . . . . : 2001:db8:8311:f70f:0:5efe:157.54.139.57 IP Address. . . . . . . . . . . . : fe80::5efe:157.54.139.57%2

Default Gateway . . . . . . . . . : fe80::5efe:157.56.253.8%2

For Windows Server 2003, Windows XP with SP2, and Windows XP with SP1, you can also use the netsh interface ipv6 show address command to view your IPv6 addresses. Here is an example: Interface 4: Ethernet Addr Type DAD State Valid Life Pref. Life Address --------- ---------- ---------- ---------- ----------------------------------- Anonymous Preferred 596758 78191 2001:db8:8311:f282:1460:5260:c9b1:fda6 Anonymous Deprecated 510530 0 2001:db8:8311:f282:b973:4db8:97e2:e978 Public Preferred 2591874 604674 2001:db8:8311:f282:200:39ff:fe0e:fc35 Public Preferred 2591874 604674 fec0::f282:200:39ff:fe0e:fc35 Link Preferred 4294967295 4294967295 fe80::200:39ff:fe0e:fc35 Interface 3: 6to4 Tunneling Pseudo-Interface Addr Type DAD State Valid Life Pref. Life Address --------- ---------- ---------- ---------- ----------------------------------- Other Preferred 4294967295 4294967295 2002:9d3b:8b39::9d3b:8b39 Interface 2: Automatic Tunneling Pseudo-Interface Addr Type DAD State Valid Life Pref. Life Address --------- ---------- ---------- ---------- ----------------------------------- Public Preferred 2591700 604500 fec0::f70f:0:5efe:157.54.139.57 Public Preferred 2591700 604500 2001:db8:8311:f70f:0:5efe:157.54.139.57 Link Preferred 4294967295 4294967295 fe80::5efe:157.54.139.57 Interface 1: Loopback Pseudo-Interface Addr Type DAD State Valid Life Pref. Life Address --------- ---------- ---------- ---------- ----------------------------------- Loopback Preferred 4294967295 4294967295 ::1 Link Preferred 4294967295 4294967295 fe80::1 How to PING? Windows Server 2003, Windows XP with SP2, and Windows XP with SP1 include an IPv6-enabled version of the Ping.exe tool. When you ping a link-local address with the Ping.exe tools, you must include a zone identifier (ID), which specifies the interface over which the ICMPv6 Echo Request messages are sent. For link-local addresses, the zone ID is typically equal to the interface index, as displayed in the output of the netsh interface ipv6 show interface or command. For site-local addresses, the zone ID is equal to the site number, as displayed in the output of the netsh interface ipv6 show interface level=verbose command. If multiple sites are not being used, a zone ID for site-local addresses is not required. The zone ID is not needed when the destination is a global address. For example, to send ICMPv6 Echo Request messages to the link-local address

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fe80::260:97ff:fe02:6ea5 using zone ID 4 (the interface index of an installed Ethernet adapter), use the following command: ping fe80::260:97ff:fe02:6ea5%4 Red Hat Linux 7.1 to 9 Add NETWORKING_IPV6=yes to /etc/sysconfig/network. Add IPV6INIT=yes to /etc/sysconfig/network-scripts/ifcfg-eth0. NetBSD 1.5 to 1.6.1 Add ip6mode=autohost to /etc/rc.conf. FreeBSD 5.0 Add ipv6_enable="YES" to /etc/rc.conf. Mac OS X 10.2 Add IPV6=-YES- to /etc/hostconfig. Verifying your configuration (sample from MacOSX) Mants# ifconfig lo0: flags=8049 mtu 16384 inet 127.0.0.1 netmask 0xff000000 inet6 ::1 prefixlen 128 inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1 gif0: flags=8010 mtu 1280 stf0: flags=0 mtu 1280 en0: flags=8863 mtu 1500 inet6 2001:db8:c18:1::123 prefixlen 64 inet6 fe80::214:51ff:fe2e:eee6%en0 prefixlen 64 scopeid 0x4 inet 202.12.29.207 netmask 0xffffff80 broadcast 202.12.29.255 inet6 2001:dc0:2001:6:214:51ff:fe2e:eee6 prefixlen 64 autoconf ether 00:14:51:2e:ee:e6 media: autoselect (100baseTX ) status: active supported media: none autoselect 10baseT/UTP 10baseT/UTP 10baseT/UTP 100baseTX 100baseTX 100baseTX 1000baseT 1000baseT 1000baseT 1000baseT en1: flags=8863 mtu 1500 inet6 fe80::214:51ff:fe86:5706%en1 prefixlen 64 scopeid 0x5 inet 203.119.0.8 netmask 0xffffffe0 broadcast 203.119.0.31 inet6 2001:dc0:2001:5:214:51ff:fe86:5706 prefixlen 64 autoconf ether 00:14:51:86:57:06 media: autoselect status: active supported media: autoselect fw0: flags=8863 mtu 4078 lladdr 00:14:51:ff:fe:2e:ee:e6 media: autoselect status: inactive supported media: autoselect

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PING and Traceroute? Ping Ping6 fe80::260:97ff:fe02:6ea5%4 Traceroute Traceroute6 fe80::260:97ff:fe02:6ea5%4

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Exercise 2 IPv6 Subnetting Below are ways on how to subnet an IPv6 address It contains the following sections: Introduction to IPv6 subnetting Subnetting IPv6 Aggregating IPv6 Exercise Scenario Scenario 1 = Create a subnet of /35 from the /32 IPv6 address Scenario 2 = Create a subnet of /48 from the sub-subnet of each /35 IPv6 address Scenario 3 = Create a subnet of /64 from the sub-subnet or each /48 IPv6 address

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Introduction to IPv6 subnetting IPv6 address subnetting works the same way on how we subnet our IPv4 addresses by bits except that IPv6 looks more complicated because it has 128 bits and the fact that it uses a HEX digit to present the address. IPv6 address area broken into eight columns separated by a colon :. Each column contains a HEX digit and each HEX digit has 4 bit (16 bits per column) which is equivalent to a 4 bytes hexadecimal value per column. In the past IPv6 Global Unicast address uses the TLA/NLA/SLA format. That format has been replaced already by the coordinated policy defined by the Regional Internet Registry (RIRs). The format we are using to date is the IPV6 Addressing Architecture (ARCH ) format (RRC3587). | n bits | m bits | 128-n-m bits | +-------------------------+-----------+----------------------------+ | global routing prefix | subnet ID | interface ID | +-------------------------+-----------+----------------------------+ Subnetting an IPv6 Address Given Scenario: An ISP network contains 5 segments were each segments has 4 router each. The IPv6 address prefix allocated by the RIR is 2001:00AA::/32. Create a smaller subnet of the allocated block space based on each scenario requirements. Scenario 1 : Create a smaller subnet of /35 IPv6 address block from the /32 allocated address. 2001:00AA::/32 Prefix 1 2001:00AA::/35 (bonus answer) 2 3 4 5 6 7 8 9 10

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Scenario 2 : Create a smaller subnet of /48 IPv6 address block from each of the sub-subnet of /35. 2001:00AA:0000:/35 or 2001:AA::/35 Prefix 1 2001:00AA:0001/48 (bonus answer) 2 3 4 5 6 7 8 9 10

2001:00AA:2000::/35 or 2001:AA:2000::/35 Prefix 1 2001:00AA:2001:/48 (bonus answer) 2 3 4 5 6 7 8 9 10

Scenario 3 : Create a smaller subnet of /64 IPv6 address block from each of the sub-subnet of /48. 2001:00AA:0001::/48 or 2001:AA:1::/48 Prefix 1 2001:00AA:0000:0001/64 (bonus answer) 2 3 4 5 6 7 8 9 10

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Exercise 3 IPv6 Network Topology The exercise is based on an ISP IGP topology. It contains the following sections: Identifying the segment Distributing IPv6 address space to each segment Assigning IPv6 address to each network devices Exercise Scenarios Scenario 1 = IP address for each segments Scenario 2 = IP address for each network routers

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IPv6 network topology IPv4 address : 192.168.0.0/19 IPv6 Address : 2001:00AA::/32

R3 R4

R2 R1

R8 R5

R6 R7 R11 R10

R12 R9

R15 R16

R13 R14 R20

R17

R19 R18

Segment 2

Segment 1

Segment 4

Segment 3

Core

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Sub-allocate the possible subnet youve created in Exercise 2 for each scenario requirements. Scenario 1 Sub-allocate the /35 subnet to each network segments. Segment no. Segment sub prefix (/35) Core 2001:00AA::/35 (bonus answer) 1 2 3 4 Scenario 2 Assign the /48 subnet to each network routers. Router no.

Router no.

Segment sub prefix (/48)

R 1 2001:00AA:1:/48 (bonus ans) R 11 R 2 R 12 R 3 R 13 R 4 R 14 R 5 R 15 R 6 R 16 R 7 R 17 R 8 R 18 R 9 R 19 R 10 R 20 Scenario 3 Assign the /64 subnet to each network router interfaces. Router no.

Router no.

Segment sub prefix (/48)

R 1 2001:00AA:1:1/64 R1-R2 R 11 R 2 R 12 R 3 R 13 R 4 R 14 R 5 R 15 R 6 R 16 R 7 R 17 R 8 R 18 R 9 R 19 R 10 R 20

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Exercise 4 Configuring Router Interfaces with IPv6 The configurations are based on Cisco and Quagga Exercise contains: Configuring router interfaces with IPv6 Verifying the IPv6 interface configuration Creating a virtual IPv6 interface Scenario exercises:

Scenario 1 : Configure Routers (R1 - R4) point-to-point address using only IPv4 /30 prefix

Scenario 2 : Configure Routers (R5, R9, R13, R17) interface to run dual-stack, IPv4 and IPv6 point-to-point address with /30 for IPv4 and /64 for IPv6

Scenario 3 : Configure Routers (R6, R7, R8, R10, R11, R12, R14, R15, R16, R18, R19, R20) with IPv6 only using /64 prefix

for the point-to-point

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Configuring router interfaces with IPv6 address Configuring router interfaces with IPv6 addresses are almost similar to how IPv4 address is configured. In some vendors it may require additional parameters to enable IPv6 processing on the interface. Cisco Router IPv6 configuration Configuring Interfaces The router has several different interfaces, which are required to be configured lets assume we are configuring the eth0.

1. Select the appropriate interface required prior to configuration. 2. Once selected ensure that the interface is up. Issue the command show

interface

Myrouter # show interface eth0

3. Choose the interface to be configured and provide the IP Address to it. Example: Eth0 configuration

Myrouter # configure terminal Myrouter(config) # interface eth0 Myrouter(config-if) #

4. Configure the IP address for the interface selected.

Example: Eth0 configuration with a /64 subnet

Myrouter(config-if) # ipv6 address ipv6 address/prefix size in CIDR

Myrouter(config-if) # ipv6 address 2001:AA::1/64

5. To configure dual stack with IPv4 address for the interface selected.


Myrouter(config-if) # ip address ipv4 address subnet mask in CIDR

Myrouter(config-if) # ip address 192.168.0.1 255.255.255.252

6. Enable IPv6 on the interface selected.

Example: Eth0

Myrouter(config-if) # ipv6 enable

7. Exit from the interface configuration and enable IPv6 Unicast datagram

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forwarding by typing the command below.

Myrouter(config) # ipv6 unicast-routing

8. Save the configuration by issuing the command: write

Quagga Router IPv6 configuration Configuring Interfaces The router has several different interfaces, which are required to be configured lets assume we are configuring the eth0.

1. Select the appropriate interface required prior to configuration. 2. Once selected ensure that the interface is up. Issue the command show

interface

Myrouter # show interface eth0

3. Choose the interface to be configured and provide the IP Address to it. Example: Eth0 configuration

Myrouter # configure terminal Myrouter(config) # interface eth0 Myrouter(config-if) #

4. Configure the IP address for the interface selected.




5. To configure dual stack with IPv4 address for the interface selected.


Myrouter(config-if) # ip address ipv4 address subnet mask in CIDR

Myrouter(config-if) # ip address 192.168.0.1 255.255.255.252

6. Exit from the interface configuration and enable IPv6 Unicast datagram forwarding by typing the command below.

Myrouter(config) # ipv6 fowarding

7. Save the configuration by issuing the command: write

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Verify router interfaces with IPv6 address For Cisco and Quagga Simply type show interface Sample output (Quagga) Interface en1 is up, line protocol detection is disabled index 5 metric 1 mtu 1500 HWaddr: 00:14:51:86:57:06 inet6 fe80::214:51ff:fe86:5706/64 inet6 2001:dc0:2001:5:214:51ff:fe86:5706/64 inet 203.119.0.8/27 broadcast 203.119.0.31 input packets 680238, bytes 581266166, dropped 0, multicast packets 50719 input errors 0 output packets 526122, bytes 85543661, multicast packets 0 output errors 0 collisions 0 Creating/configuring router virtual interfaces for IPv6 tunnel NOTE: only applies to Cisco routers

1. Choose your tunnel interface number. 2. Once selected create the interface by Issuing the command below:

Example: Tunnel Interface 0

Myrouter # configure terminal Myrouter(config) # interface tunnel0 Myrouter(config-if) #

3. Configure the IPv6 address for the interface created.

Example: Interface Tunnel 0 configuration with a /64 subnet



4. Enable IPv6 for the interface created.

Example: Interface Tunnel 0

Myrouter(config-if) # ipv6 enable

5. Select and define the tunnel source interface for the IPv6 traffic tunnel to an IPv4 network.

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Myrouter(config-if) # tunnel source eth0 Note: (eth0 must have an IPv4 address)

6. Define the tunnel destination IPv4 address.


Myrouter(config-if) # tunnel destination 192.168.1.2 Note: (destination address must accessible from the IPv4 network)

7. Define the tunnel mode.


Myrouter(config-if) # tunnel mode ipv6ip Note: (ipv6ip tunnel mode is for manual IPv6 tunnel to an IPv4 network)

8. Save the configuration by issuing the command: write Scenario 1 Note: Replace the IP address with the designated IP addresses of the point-to-point

Cisco Router

Myrouter(config)interface Eth0 Myrouter(config-if) ip address 192.168.0.1 255.255.255.252

Quagga Router

Myrouter(config)interface Eth0 Myrouter(config-if) ip address 192.168.0.1 255.255.255.252

Enable IP forwarding

Myrouter(config)ip forwarding Scenario 2 Note: Replace the IP address with the designated IP addresses of the point-to-point

Cisco Router

Myrouter(config)interface Eth0 Myrouter(config-if) ip address 192.168.0.1 255.255.255.252 Myrouter(config-if) ipv6 address 2001:AA::1/64 Myrouter(config-if) ipv6 enable

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interface Tunnel0 no ip address ipv6 address 3FF3:B00:C18:1::3/64 ipv6 enable tunnel source Eth0/1 tunnel destination 192.168.1.2 tunnel mode ipv6ip

Quagga Router

Myrouter(config)interface Eth0 Myrouter(config-if) ip address 192.168.0.1 255.255.255.252 Myrouter(config-if) ipv6 address 2001:AA::1/64

Enable IPv6 forwarding

Myrouter(config)ipv6 forwarding Scenario 3 Note: Replace the IP address with the designated IP addresses of the point-to-point

Cisco Router

Myrouter(config)interface Eth0 Myrouter(config-if) ipv6 address 2001:AA::1/64 Myrouter(config-if) ipv6 enable Quagga Router

Myrouter(config)interface Eth0 Myrouter(config-if) ipv6 address 2001:AA::1/64

Enable IPv6 forwarding

Myrouter(config)ipv6 forwarding

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Exercise 5 Configuring IPv6 static route The following configurations are based on Cisco and Quagga. It contains the following sections: Configuring Static route Exercise Scenario Scenario 1 = Configure static route for Routers (R5, R9, R13, R17) for the tunnel

interface

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Configuring static route To be able to reach a certain destination network a route must be available. The route is required by the router to forward the packet to its destination. Static route in IPv6 is similar on how you create the static route in IPv4. Router static route configuration

Cisco Router

Myrouter(config)ipv6 route destination network/prefix outbound interface or next hop IP address

Myrouter(config)ipv6 route 2001:AA::/35 tunnel0 Or

Myrouter(config)ipv6 route 2001:AA::/35 2001:AA::1 Quagga Router

Myrouter(config)ipv6 route destination network/prefix outbound interface or next hop IP address

Myrouter(config)ipv6 route 2001:AA::/35 tun0 Or

Myrouter(config)ipv6 route 2001:AA::/35 2001:AA::1

Verifying the static route configuration

Cisco Router

Myrouter# show ipv6 route

Quagga Router

Myrouter# show ipv6 route

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Exercise 6 Configuring IPv6 Dynamic Routing on IGP (OSPF) The following configurations are based on Cisco and Quagga. It contains the following sections: OSPF Basics Configuring OSPF with IPv6 OSPF Process configuration OSPF Area configuration OSPF Interface configuration Verifying OSPF IPv6 configuration Exercise Scenarios Scenario 2 = Configuring OSPF with IPv6

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OSPF Basic Open Shortest Path First (OSPF) is a link-state routing protocol that sends link-state advertisements (LSAs) to all other routers within the same hierarchical area to make an update. Information on attached interfaces, metrics used, and other variables is included in OSPF LSAs. OSPF speaking routers uses the Shortest Path First (SPF) algorithm (Dijkstra) to calculate the shortest path to each node to gather accurate link-state information. OSPF currently has two versions. Version 2 for is use IPv4, while version 3 is created support IPv6. Both versions can co-exist in the router configuration. OSPF Process configuration

Cisco router

1. Type ipv6 router ospf and the process IP number in command prompt of the IPv6 ospf exec mode to configure the ospf protocol.

router#configure terminal router(config)#ipv6 router ospf [Process-id]

2. Define the network that needs to be included in the OSPF. router(config-rtr)#area [Area-id] range [IPv6-prefix/prefix-length] on CIDR

3. Enable OSPF on an Interface that will join the IPv6 OSPF network.

router(config-if)#ipv6 ospf [Process-id] area [Area-id] Sample Configuration ====================

router#configure terminal router(config)#ipv6 router ospf 10 router(config-rtr)# area 0 range 2001:AA::/64(for point-to-point) router(config-rtr)# area 0 range 2001:AA::1/48 (for LAN network) Interface configuration ======================= router(config-if)# ipv6 ospf 10 area 0

4. Save the configuration by typing write

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Quagga router

1. Type ipv6 router ospf in command prompt of the IPv6 ospf exec mode to configure the ospf protocol.

router#configure terminal router(config)#ipv6 router ospf

2. Define the network that needs to be included in the OSPF. router(config-rtr)#area [Area-id] range [IPv6-prefix/prefix-length] on CIDR

3. Enable OSPF on an Interface that will join the IPv6 OSPF network.

router(config-router)#interface [interface number] area [Area-id] Sample Configuration ====================

router#configure terminal router(config)#ipv6 router ospf 10 router(config-router)# area 0.0.0.0 range 2001:AA::/64(for point-to-point) router(config-router)# area 0.0.0.0 range 2001:AA::1/48 (for LAN network) router(config-router)#interface eth10 area 0

4. Save the configuration by typing write

Verifying OSPF process

1. Verify the configuration if the routing process is working properly by typing the commands below:

show ipv6 route (to check the routing table) sh ipv6 ospf interface (to check interface participating OSPF) sh ipv6 ospf neighbor (to check neighbor list) sh ipv6 ospf database (to check database summary list)

26 IPv6 Exercises

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