Network Solution for Windows – Windows system, Linux system, Ubuntu server configuration tip

Address unknown
Address unknown 0:0:0:0:0:0:0:0 form. This address is not assigned to any intervention. Host an initialize when you can use this address as source address before the address. This address can never be the destination address of packets.

Loopback Address
Loopback Address 0:0:0:0:0:0:0:1 form. Node can use this address to send packets to itself. Therefore, a packet carrying Looback address is never out of the Node.

Address IPv6-IPv4-embedded
Type this address used in the Automatic Tunneling, a mechanism used in the process of transition from IPv4 to IPv6. Address this type formed by 0 prefix 96 bit, 32 bit remainder from an IPv4 address complete. When IPv6 Node tradition with Automatic Tunneling, address Tunneling of IPv4 will be separated from the IPv4-IPv6-embedded (this mechanism will be presented in the following).

Architecture addresses embedded IPv4-IPv6-Address.
There is also a second type of IPv6 addresses this called IPv4-mapped IPv6. Address IPv6 also offers information about IPv4 addresses.

Allocate IPv6 address
With size 128 bits, IPv6 has an address space giant. However,
not all of these addresses are used. To increase the effectiveness of the use of address and the effective routing. The system is often designed by decentralized model. IPv6 also show in accordance with this trend, with the ability of his. The distinction between different levels by the format prefix FP (Format prefix).

Allocate IPv6 address
With this allocation, an address for the NSAP, a section for IPX addresses. The rest will be reserve for the future. These can be used to extend the address range is used (eg the ISP level for newly established or provided for organizations’ needs).

Note: Anycast group address is not specified in the table because this allocation is not Anycast addresses of a subset of the address space Unicast.

To manage and allocate the address space effectively, the necessary
Next IPv6 protocol has two levels of the address as follows:

The level of general

Withdraw from the experience allocation of IPv4 addresses, the IPv6 designers have built a mechanism to allocate address completely open, creating favorable conditions for the amendment as a few types of structure addresses or expand certain address in the future. This is completely in accordance with a protocol is in development stage and has been completed.

Classification IPv6 addresses not only to provide sufficient pattern and form
prefix form. This not only allows the Host to identify the type of address, but also allow Host can behave differently for each address. For example the address prefix FE80:: / 16, Host will receive here is the address Link-local only used to connect the Host in the network. Or for address prefix 3FFE:: / 16 Host will understand this is the address of the network 6BONE provided.

Address allocated by provider
According to the structure of the table allocation address above, one of the address type is in the form of Global Unicast addresses. Type this address allows a defined Interface on the Internet (IPv6 network) is only nát worldwide. Meaning it’s the same Global IPv4 addresses today. Space Global Unicast addresses is quite large, so the designers had planned IPv6 address provided by the service provider. Mechanism of this level has been presented in the “Global Unicast Address.”

Writing IPv6 addresses
IPv6 address length of 128 bit memory problems should address is very difficult. If
usually written as IPv4 addresses, the IPv6 address each divided into 16 groups by the number 10. So the designers have chosen writing 8 to 128 bit according to the group 16, each separated by preventing colon (“:”).

Example:

FE80: BA96: 4367: BFFA: 6784:3213: BAAC: ACDE.

Points of favorable signs Hexa is succinct and wall minh. However, how
write this cause many difficulties for the management network.
One way to do simply that rules allow abbreviations. IPv6 in the
the first development, IPv6 addresses are not used much, so most of the bit structure address is 0.

A first improvement is allowed to ignore the 0 before each module 16, can write 0 instead of writing 0000. For example: the 0008 block, we can write 8. with block 0800, you can write 800. Through this writing, we can write a short way over.

For example

1080:0:0:0:8:800:200 c: 417A.

There is also a rule to allow other shortened, that is conventional about writing colon Double (Double-Colón). In an address, a control group of 0 can be replaced by the double colon. For example you can replace the 0:0:0 group in the first instance by “::”. We have 1080:: 8:800:200 C: 417A ..

Address this stands, we can write the exact address because the original rules follows: the left flat on the left marked by “::” in the address, then ground to all of the left marked “::” and all were taken with 0.

For example

1. FEDC: BA98:: 7654:3210 => FEDC: BA98: 0:0:0:0:7654:3210.
2. FEDC: BA98: 7654:3210:: => FEDC: BA98: 7654:3210:0:0:0:0.
3. :: FEDC: BA98: 7654:3210 => 0:0:0:0: FEDC: BA98: 7654:3210.

Convention of using the mark “::” is used only once in each IPv6 address.

For example: 0:0:0: BA98: 7654:0:0:0 can write to: BA98: 7654:0:0:0 or 0:0:0: BA98: 7654:: Where:: BA98: 7654:: is not valid because the system will not identify the IPv6 address is correct.

There is a special case to note. For address types IPv4-IPv6 embedded is formed by assigning 96 bits to 0 before an IPv4 address. To restrict the ability to confusion in the transition period between the symbols in the decimal IPv4 with dots in the cross lục IPv6. The IPv6 design also establishes a mechanism to resolve this issue.

For example: with an IPv4 address 10.0.0.1. Address IPv4 embedded IPv6-formatted 0:0:0:0:0:0: A00: 1, we can still keep colon decimals by the end. In this case, write the address as:: 10.0.0.1.