IPV4 and IPV6 Address

IPV4 and IPV6 address

Objective

Yesterday, the computer let others speed limit,I had a nightmare last night.,should I learn some cyber-security knowledge?,that way.,I don't invade people.,people invade me .,and I can protect myself .,Actually, if everyone is okay,,Don't you mess with me .,I'm not messing with you.,I saw an article about Black hat and white hat.,someone's a black hat for pleasure .,to make money .,or for something else .,when white hat people want to maintain the security of the network,I have no right to say who's good or bad .,Anyway, personally, I think we should learn some cyber security..

Previous article review

Ipaddress isIPan important part of the agreement,it can identify any device that is connected to the Internet. in the IP relay , we have seen that the IP packet header is written with the starting point and destination IP Address . IP address and router mates that are carried on IP packets , eventually allowing IP The package is transferred from one computer on the Internet to another computer .

InIPin the package relay,we are toIPV4As an example illustratesIPThe format of the package,IPV4 and IPV6 are the two IP Protocol versions that have appeared successively. IPV4the address is a +bit of0/1sequence,like10101010 00000000 11111111 01010101.for the convenience of human records and reading,we will usually +bit0/1into4segment8bit sequence,use decimal to denote each paragraph( This,a section of the range is0to the255),point number between segment and segment(.)separated.For example, the above address is indicated as170.0.255.85. IPV6the address is -bit of0/1sequence,It also presses8bit Segmentation,record each paragraph in hexadecimal(use hexadecimal instead of decimal,It's going to get written out.IPV6address is a little shorter),colon between segment and segment(:)Split.

IpAllocation of addresses

Ipthe allocation of addresses is a policy issue. ICANNis the central governing body of the Internet. ICANNof theIANADepartment is responsible for theIPaddress assigned to5a regional Internet registry(RIR),likeAPNIC,It is responsible for the Asia PacificIPDistribution.thenRIRThe address is further assigned to the localISP,such as China Telecom and Netcom. ISPand then, according to my own situation,,will beIPassigned to an organization or assigned directly to a user,such as theAclass address assigned to a very large organization,and WillCclass address assigned to an internet café.institutions can be further distributed within the LANIPaddress to each host.

Not all addresses are assigned , some addresses are reserved for broadcast , test , private network use, etc. . These addresses are called private addresses . . You can query RFC5735 to see if those addresses are private addresses. .

Note : RFC (Request for Comments) is a series of technical documents used to document Internet -related technical and protocol provisions . each one RFC the file has a fixed number . They are an important property of the Internet. , You can find the RFC file by http://www.rfc-editor.org/ . This dick won't work . ..

IPV4Address Exhaustion

since the address of the IPV4 protocol is a three-bit , It can provide 2^32, which is about billions of addresses .If the earth people each oneIPaddress., IPV4the address is far from enough..Not to mention,per capita access to more than one network device,

AlthoughSome technical measures ( such as NAT ) have slowed down the urgency of the situation ,butIPV4the day after the address is exhausted, it will come soon..it's obvious ., We need more IP addresses .,to meet the explosive growth of Internet-based devicesIPAddress Requirements.

Much longer=Better

Ipv6 The address of the agreement is the most important improvement is : Span style= "font-family: Arial" > extended 128 bit accurate to say ,ipv4 by 4 and ipv6 there

340,282,366,920,938,463,374,607,431,768,211,456 an address .

This number may be too big.,cause you have no idea.,we'll probably have to figure out,the Earth's surface area is about510,067,866,000,000sqm,in a square centimeter(It's about fingernails size .)within the area we can have6.67x1016aIPAddress! So in a short period of time, we should not seeIPv6the embarrassment of being exhausted. (do not rule out that in the future the computer will appear in molecular size, then we'll haveIPv6exhausted the crisis.).

So, in order to solve the IPv4 Address depletion crisis, this is the conclusion:

Using IPv6

Summarize

The IPv address is being exhausted , while the IPV6 longer sequence provides more IP addresses . Migration of IPv4 to IPv6 is taking place .

the process of blocking migration is mainly due to incompatible IPv4 and IPv6 formats . Old Router Support IPv4 format of IP Package , but they don't understand . IPV6 format of IP Package . So.This migration process must accompany the update of the equipment.however,Many of our internet assets are built onIPV4of the network,It's not going to stop overnight .IPv4services, and the overall migration toIPv6in the network,This migration process is doomed to be full of bumpy.

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IPV4 and IPV6 Address