Configure IPv6 Neighbor Discovery

Network Requirements

• Device and PC belong to one LAN.
• Configure the interface of Device gigabitethernet0/0/1 with the EUI-64 address.
• PC gets the IPv6 address prefix via the IPv6 neighbor discovery protocol, configure the IPv6 address according to the got address automatically. Realize the communication of the IPv6 protocol between PC and Device.

Network Topology

Figure 5-2 Networking for configuring IPv6 neighbor discovery

Configuration Steps

Step 1: Enable the IPv6 forwarding capability of the device.

Step 2: Configure the EUI-64 unicast address, and enable the RA advertising function.

#Configure Device gigabitethernet0/0/1 with the EUI-64 address, and enable the RA advertising function of gigabitethernet0/0/1.

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  By default, the RA advertising function is disabled.

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#View the interface information of Device.

Device#show ipv6 interface gigabitethernet0/0/1 gigabitethernet0/0/1 is up 
  VRF: global 
  IPv6 is enable, link-local address is fe80::0201:7aff:fe5d:e7d3 
  Global unicast address(es): 
    2001:0001::0201:7aff:fe5d:e7d3, subnet is 2001:0001::/64 [EUI] 
  Joined group address(es): 
    ff02::0001:ff00:0 
    ff02::0002 
    ff02::0001 
    ff02::0001:ff5d:e7d3 
  ND control flags: 0x85 
  MTU is 1500 bytes 
  ICMP redirects are enabled 
  ICMP unreachables are enabled 
  ND DAD is enabled, number of DAD attempts: 1 
  ND reachable time is 30000 milliseconds 
  ND advertised reachable time is 0 (unspecified) 
  ND advertised retransmit interval is 0 (unspecified) 
  ND config flags is 0x0  
  ND MaxRtrAdvInterval is 600  
  ND MinRtrAdvInterval is 198  
  ND AdvDefaultLifetime is 1800” 

Step 3: Configure PC.

#On the PC, install the Ipv6 protocol. The Ipv6 configuration depends on the operation system. This text takes Windows XP as an example to describe.

Step 4: Check the result.

#View the PC interface information.

C:\>ipconfig 
…………(some displayed information is omitted) Ethernet adapter 130: 
 
        Connection-specific DNS Suffix . : 
        IP Address. . . . . . . . . . . 130.255.128.100 
        Subnet Mask . . . . . . . . . . . : 255.255.0.0 
        IP Address  : 2001:1::15b3:d4:f13d:c3da 
        IP Address  : 2001:1::3a83:45ff:feef:c724 
        IP Address  : fe80::3a83:45ff:feef:c724%6 
        Default Gateway : fe80::201:7aff:fe5e:cfc1%6 

You can see that the PC gets the Ipv6 address prefix 2001:1::/64, and generates the global unicast address according to the prefix automatically.

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  After the Windows XP host gets the address prefix, it generates two global unicast addresses. The interface ID of one address is generated according to the MAC address of the interface, and the interface ID of the other address is generated randomly.

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#On Device, ping the link local address of the PC fe80::3a83:45ff:feef:c724.

Device#ping fe80::3a83:45ff:feef:c724 
 
Press key (ctrl + shift + 6) interrupt it. 
Sending 5, 76-byte ICMP Echos to fe80::3a83:45ff:feef:c724 , timeout is 2 seconds: 
 
Output Interface: gigabitethernet0/0/1 
!!!!! 
Success rate is 100% (5/5). Round-trip min/avg/max = 0/29/149 ms. 

#On Device, ping the auto generated global unicast address 2001:1::15b3:d4:f13d:c3da and 2001:1::3a83:45ff:feef:c724 on the PC.

Device#ping 2001:1::15b3:d4:f13d:c3da 
 
Press key (ctrl + shift + 6) interrupt it. 
Sending 5, 76-byte ICMP Echos to 2001:1::15b3:d4:f13d:c3da , timeout is 2 seconds: 
!!!!! 
Success rate is 100% (5/5). Round-trip min/avg/max = 0/36/183 ms. 
 
Device#ping 2001:1::3a83:45ff:feef:c724 
 
Press key (ctrl + shift + 6) interrupt it. 
Sending 5, 76-byte ICMP Echos to 2001:1::3a83:45ff:feef:c724 , timeout is 2 seconds: 
!!!!! 
Success rate is 100% (5/5). Round-trip min/avg/max = 0/26/133 ms. 

PC and Device can ping each other.

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  When pinging the link local address, it is necessary to specify the egress interface, which is the interface on the same link of the ping link local address.

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