RENIX_ IPv6 automatic configuration -- practical operation of network tester

  One 、IPv6 Introduction to automatic configuration

1. function

（1） By some mechanism , Get the prefix information of the network when actively sending routing requests or passively accepting routing announcements , Then the host generates the interface of the address itself ID part

（2）RFC 4862 IPv6 Stateless Address Autoconfiguration

（3）RENIX Only send as Route Solicitation Message

2. Protocol Brief

Address request process

（1） The host will become link local Address

（2）（ Optional ） To configure DAD（ Duplicate address detection ）, When no duplicate address is detected , send out RS message

（3） Received from the router RA Reply message , Combine with your own interface ID RA The routing prefix in the message generates the global unicast address

（4） Proceed again DAD testing , The real global address is when there is no duplicate address

3. Duplicate address detection

（1） Duplicate address detection （DAD）： Use in the interface IPv6 Before unicast address , Detect whether other nodes use this address

Before duplicate address detection ,IPv6 Unicast address is “ temporary ” state （Tentative Address）;

It's done DAD After testing , Will enter “ The preferred ” state （Prefere Address）;

If duplicate addresses are found , Then the address becomes “ abandoned ” state （Duplicated Address）.

（2） Repeat the address detection process

Host to Solicited-Node The multicast group sends a message with the target address as the request address NS message ;

If there is no duplicate address , Will not receive the corresponding NA Reply message , The destination address is from “ temporary ” The state becomes “ The preferred ” state ;

If there is a duplicate address , Will receive the corresponding NA Reply message , The destination address is from “ temporary ” The state becomes “ abandoned ” state .

4. Interface identifier

Interface identifier generation

Manual configuration ;

The system is automatically generated by software ;

Use IEEE-EUI-64 Specification generation .

Two 、 Test instructions

1.IPv6 Automatically configure topology

（1） Test purpose

verification DUT IPv6 SAA Basic function .

（2） testing procedure

Connect the topology according to the graph ;

Port1 Docking switches G1 mouth , For acquisition IPv6 Address ;

Port2 Docking switches G2 mouth , Used to send verification traffic .

（3） Expected results

Tester Port1 The port can be obtained successfully IPv6 Address ;

Port1 The port can receive data from Port2 Verified traffic of .

2. preparation : Add frame

（1） Open software

（2） Booking port

 （3） Input IP Address

 3. preparation : Booking port

Test on the selected port , One port is enough

3、 ... and 、 Test configuration

1. Select Wizard  

choice IPv6 Auto configuration wizard

2. Select port

Select the port to participate in the test

3. Choose encapsulation 、 Configure interface 、 Configure the link layer

4. Configure the network layer 、 To configure IPv6 Automatic configuration

Be careful ： Can make EUI-64 and Enable address duplicate detection （DAD）

5. preview

Click... After the preview is OK “ complete ”

6. Configuration complete

7.DUT To configure

Take Huawei switches as an example ：

#

IPv6

#

Interface GigabitRthernet0/0/1

Undo portswish

Ipv6 enable

Ip address 2020::2 64

Undo ipv6 nd ra halt

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Four 、 Test startup

1. Call up relevant statistics

2. Open the protocol capture

3. start-up IPv6 Automatic configuration test

4. Test success

Session state by Idle Turn into Bound, Automatic configuration test succeeded

5. View message

NS The message is an address duplication check message ,RS The message is the request message sent by the tester ,RA The message is the route announcement replied by the switch , Contains information such as network prefix

6. Check the test results

At this time, the interface of the tester IPv6 The address has changed to an automatically configured address

7. Stream validation

Tester P2 Port establishment is sent to P1 Acquired IPv6 Address traffic ,P1 The port can receive this traffic