Hello Guys,
I did this summary on the most important of IPv6 to be didactic, comprehensive and objective. The level of coverage of this summary would be midway between BSCI and CCNA certifications. Below.

IPv6

- We added several features compared to IPv4, such as 128 bits for addressing (IPv4 only 32), security (through extension headers), techniques to transition from IPv4 to IPv6, QOS embebbed (direct the header), Autoconfiguration ( allows a host to obtain an IP address without having to run DHCP on the network) and IP mobility.
- The IPv6 address has 128 bits and is divided into 8 ’sextet’, each with 16 bits.
- The Header (including the source and destination IP) has 320 bits, without the extensions - below.

- IPv6 does not have the checksum field (and not the place), considering that the control of errors of lower layers is reliable.
- IPv6 USA not broadcast, but multicasting. A broadcast can be simulated by sending a multicast address to the All-nodes, link-local scope (FF02:: 1).
- Loopback Address -:: 1 / 128 (IPv4 = 127.0.0.1). Address default-route -: 0 / 0 (IPv4 = 0.0.0.0 / 0).
- EUI-64: format derived from the MAC-address used to assign addresses Link-Local. You get the MAC address (48 bits), the hexadecimal number FFFE inserted in the middle of it and changed the first 2 bits (from 00 to 20), so the MAC 00eb.1234.3322 in EUI-64 format would be: 02eb: 12ff: fe34: 3322. Finally, adding the prefix for link-local addresses would: FE80:: 02eb: 12ff: fe34: 3322.
- Types of IPv6 addresses:

• Global Unicast: Identifies a single host on the Internet. Prefixes will be assigned to each organization (48 bits or less), as seen in the picture. The IANA defines the prefix for these prefixes like 2000:: / 3.
• Link-Local: Each interface receives one of these addresses. It is used for the devices on the same network to communicate without having to use the Global Unicast address. Use the prefix FE80:: / 10 + the EUI-64 format.
• Site-local. Single address within the scope of the organization, not routable on the Internet. Prefix: FEC0:: / 10.

- Multicast: Identified by prefix FF00:: / 8. The next 4 bits are flags, and the other 4 next define the scope of Multicast (shown below). Beside, a diagram of the range of scopes.

• 1 = Interface-local.
• 2 = link-local.
• 5 = site-local.
• 8 = Organization-local.
• E = Global.

- Anycast: A Global Unicast address assigned to more than one device, set it as anycast. Has as its route to the nearest anycast device. See below.

- IPv6 Hosts must meet at least the following addresses:

• Global Unicast and Anycast (2000:: / 3)
• Link-local (FE80:: / 10, by Autoconfiguration
• Loopback (:: 1 / 128)
• Multicast all-nodes (FF01:: 1 and FF02:: 1)
• Another group multicast assigned.

- Routers, and this answer should also respond in address:

• Anycast address of the subnet (the subnet address with the Interface ID - Host address - set to 0)
• All-Multicast routers (FF01:: 2, FF02:: 2, FF05:: 2)
• Groups defined by multicast routing protocols (if applicable). EIGRP for IPv6: FF02:: 10, OSPFv3: FF02:: 5 (all routers) and FF02:: 6 (only DR and BDR).

- The main forms of transition from IPv4 to IPv6 can be made through the Dual Stack (running both IPv4 and IPv6 to no longer have need for IPv4) and tunneling (encapsulate the IPv6 packet within an IPv4 packet - figure). For the tunneling is expected the prefix 2002:: / 16.

References:

- CCNP BSCI Official Exam Certification Guide 4th edition, por Brent Stewart. CiscoPress

- CCNA 4.1 Guia Completo de Estudo, por Marco Filippetti. Visual Books

- CertProject, imagem do header IPv6.

- Cisco IOS IPv6 Multicast Introduction - Very good.

- RFC 3513 Internet Protocol Version 6 (IPv6) Addressing.

I would pay special support to all who will make sure during the month of June.

A big hug,

Maurício Bento Ghem.

Hello Guys,

More interesting to a laboratory level of CCNP. This laboratory is quite simple, but illustrates the way a problem we all Network Engineers will have to face in the future.

As the wheel IPv4 Internet will be a great challenge migrate it to use IPv6 in all its points. This laboratory is illustrated the GRE tunneling between two locations using the Internet as a means (R2 simulating an IPv4 network).

Below is the topology of the network.

The IOS is used advipservicesk9-c7200-mz.124-9.T.bin available in HD blog. Follow the same recommendations for the laboratory: use and abuse of show commands and debug, modify and use the laboratory to study and learn .

Below is presented a link to download.

Lab IPv6 - 6-to-4 Tunneling (updated)

Sinceraly,

Maurício Bentow.

Hello Guys,

The topic is covered in BSCI routing and is expanded including a new version of IP protocol, the IPv6. This new protocol will provide many more tens of IPs compared to IPv4 is used today.

The IPv6 for many (including me) is very obscure and complicated, but if you study with attention and practice quite calm through laboratories you understand its operation, including giants such addresses.

The laboratory that I am offering I did to practice addressing, summarization and working with the OSPFv3 (OSPF for IPv6).

I setup a Multi-area as can be seen in the picture attached and made a summarization of some subnets to see your reflection in the routing table and OSPF in the LSAS. Remember, the OSPFv3 differs slightly from its predecessor on the LSAS, so stay tuned.

As the oldest IOSs not support the OSPFv3 was necessary to use the IOS 12.4 (T) 9, the router 7200. The image is available on this link in the folder IOS - Dynamips.

Emphasize that the configuration in NVRAM of the router is complete, and after setting everything TXTs that are in the file is the initial configuration.

Below the laboratory:

Lab IPv6 and Ospfv3 multiarea 7200

A Abrasive staff,

Maurício Bento Ghem