IPv4 to IPv6 Transition - part 2

Addressing in IPv6

A. Unicast Address (one-to-one) 

Used to communicate one on one, by pointing to one host. On Unicast address consists of:  

1. Global, addresses that are used for example to address provider or address geographical.  
2. Link Local Address is the address used within one link only. Which referred to here is the link local network connected to each other on one level. This address is created automatically by the host that has not received global address, consisting of 10 n-bit prefix that begins with "fe80" and the fields along the 118-n bits indicating the number of hosts. Link Local Address used in the provision of an IP address automatically.
3. Site-local, which is equivalent to a private address address, which is used is limited in the site only. This address can be given freely, provided unique within the site , but can not send packet with the destination address in outside of the site. 
4. Compatible

B. Multicast (One-to-many)

Multicast is used for one-on-many communication with the host of the group pointed. This in IPv4 multicast address is defined as a class D, selected based on range goals.

C. Anycast

It's refers to the host of the group, but the packets are sent only on one host only. In this type of address, an address given at multiple hosts, to define a collection of nodes. If any packets sent to this address, the router will send packets to the nearest host that has the same Anycast address. In other words, the owner handed the package to the destination router of the most "suitable" for the delivery of the package. Use this example to multiple Anycast servers that provide services such as DNS (Domain Name Server). By providing Anycast Address same address on those servers, if there are packets sent by a client to this address, the router will choose the nearest server and sends the packet to the server. Thus, the load on the server can be distributed evenly. For anycast is not provided specific rooms. If against multiple hosts are given a same address, the address is regarded as Anycast Address.

How IPv6 Address is written ?

IPv6 Address is using model x: x: x: x: x: x: x: x where 'x' in the form of 16-bit hexadecimal value portion of the address, because there are 8 pieces of 'x' is the sum total there are 16 * 8 = 128 bits. An example is

          FEDC: BA98: 7654: 3210: FEDC: BA98: 7654: 3210

If the format of IPv6 addressing group contains a collection of 16-bit addresses, ie
'x', which is 0 then it can be represented as'::'. Examples are:

                      FEDC: 0: 0: 0: 0: 0: 7654: 3210

It can be represented as FEDC:: 7654: 3210 And 0:0:0:0:0:0:0:1 can be represented as:: 1
Model x: x: x: x: x: x: dddd where 'dddd' is the IPv4 address of a kind
167.205.25.6 is used for automatic tunneling. Examples are:

                       0:0:0:0:0:0:167.205.25.6 or:: 167.205.25.6
                    0:0:0:0:0: ffff: 167.205.25.7 or: ffff: 167.205.25.7

So if now access the address on the internet for example 167.205.25.6 in time format will be replaced by a kind ::ba67: 080:18. As with IPv4, IPv6 uses bitmask for the purposes subnetting is represented as prefix-length representation on CIDR techniques used in IPv4, such as: 3ffe: 10:0:0:0: fe56: 0:0 / 60

showed that 60 bits are network side bit early. If the IPv4 IP recognize the division of classes into class A, B, and C then the IPv6 was conducted based on class divisions fomat prefix (FP) is the initial bit address format. For example:

                                   3ffe: 10:0:0:0: fe56: 0:0 / 60

then if the note 4 bits beginning of hexa '3 ' prefix obtained for 4-bit format is the beginning of 0011 (ie the value '3' hex in binary).

IPv6 class

There are several important classes of IPv6 are:

1. Aggregatable Global Unicast Addresses: it includes the addressIPv6 with 001 bit early. 
2. Link-Local Unicast Addresses: it includes the IPv6 address with a bit early 1111 1110 10.
3. Site-Local Unicast Addresses: it includes the IPv6 address with a bit early 1111 1110 11.
4. Multicast Addresses: it includes is a bit IPv6 address beginning of 1111 1111. In the IPv4 protocol known addresses 127.0.0.1 is a special kind refer to localhost, this address is represented as 0:0:0:0:0:0:0:1 or :: 1 in IPv6 protocol. In addition to the known IPv6 addresses and other special

0:0:0:0:0:0:0:0 is known as the unspecified address must not be is given as recognition to an interface.