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You are here: Home » IPv4 and IPv6 Details

By Abhishek Ghosh January 16, 2015 5:50 pm Updated on January 16, 2015

IPv4 and IPv6 Details

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Here is a basic article demystifying IPv4 and IPv6 details. IPv4 is the first version of the Protocol and is the technical basis of the Internet. IPv4 (Internet Protocol version 4), obviously was before the development of IPv6, it was included in RFC 791 in 1981. Common users do not understand these words, this article on IPv4 and IPv6 Details will help the new users as well as the somewhat new Linux Server users.

 

IPv4 and IPv6 Details : First Thing First

 

IPv4 uses 32 bit addresses, therefore; maximum 4,294,967,296 unique addresses are possible. IPv4 addresses are usually written in decimal in four blocks, for example 10.15.20.255. Each block are of 8 bits; IPv6 is 128-bit address.

An IP address is divided into a part of the network portion and a host (address). Computers are on the same IP network when the network portion of its address is the same – this is a condition that these computers can communicate with each other directly, eg via. hub, a switch or via a crosslink cable. In the same network no host address can be assigned twice.

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For communication between different networks a router is what needed. The address section assigns the responsible administrator for each participating device differently. The network address is assigned by the owner or designer of the network. On the Internet, IANA (Internet Assigned Numbers Authority) is responsible for the allocation of the network addresses.

IPv4 and IPv6 Details

The exact division between network part and the address part is the subnet mask. In CIDR notation this is written as 192.168.0.23/24 as we explained for HP Cloud Router and Subnet, the “24” means that the first 24 bits of the subnet mask are equal to 1. The bits of the subnet mask (in binary) “1”, set the digits of the IP address belonging to the network share. A typical example :

Vim
1
2
IP-address 192.168.0. 23 → 11000000.10101000.00000000. 00010111
Subnet Mask 255.255.255. 0 → 11111111.11111111.11111111. 00000000

An IP packet consists of a header and the actual data. The data section typically contains another protocol, usually TCP, UDP or ICMP. The maximum length of an IP packet is 65535 bytes (2 16 -1), the maximum data length of 65515 bytes (packet length – minimum header length of 20 bytes). Normally, the transmitter limits the packet length to that of the underlying medium.

Class will be discussed in a Separate Article.

On 3 February 2011 the IANA released the last IPv4 addresses to the Regional Internet Registries. On 15 April 2011 APNIC allocated last freely assignable addresses for the Southeast Asian region.

 

IPv4 and IPv6 Details : Second Thing Last

 

The Internet Protocol version 6 (IPv6), formerly next generation Internet Protocol (IPnG), is one of the Internet Engineering Task Force (IETF) standard since 1998. IPv6 is a method for transmitting data in packet-switched computer networks, especially the Internet. In these networks, the data packets are sent, in which, according to a layered model information from various network protocols nested to the actual user data. IPv6 is a network layer protocol (layer 3 of the OSI model ) within the Internet Protocol Suite over the involved network elements. It also regulates the process of packet forwarding between subnets (using these addresses routing ). The subnets can be operated as lower layers with different protocols that carry different physical and administrative realities thereof.

 
IPv4 and IPv6 adoption rate

On the Internet, IPv6 is currently still predominantly used in the next years version 4 of the Internet Protocol replace, as it offers a much larger number of possible addresses that may become exhausted in IPv4. Critics fear a curbing of anonymity on the Internet in view of the leaked IPv4 address assignment in Asia, Oceania and Europe.

In a URL the IPv6 address is enclosed in square brackets :

http://[2001:0db8:85a3:08d3:1319:8a2e:0370:7344]/

Brackets are for ports :

http://[2001:0db8:85a3:08d3:1319:8a2e:0370:7344]:9000

IPv6 networks in CIDR notation the first address and the length of the prefix are listed separately in bits by a slash. For example, 2001:0db8:1234::/48 for the network with the address 2001:0db8:1234:0000:0000:0000:0000:000. Mobile IP is an extension of the IPv6 standards under the name of “Mobile IPv6” (RFC 6275).

IPv4 and IPv6 can be on the same infrastructure, especially in the Internet, running in parallel. For the transition so no new wiring, network cards or devices are usually needed, provided suitable OS for this purpose is available.

Privacy advocates complain about IPv6, that here every Internet-connected device could get a fixed IP address, so all the pages you visited elicited years later and the visitors could be identified. We can not advice for immediate switching to IPv6 for OpenStack Instances as the needed security configuration for IPv4 and IPv6 is separate and running both together to resolve it on same virtual device, can increase the chance of attacks.

Most importantly, Google advocating IPv6. What Google Advocates, it can be related to NSA Spyware Activities.

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Abhishek Ghosh

About Abhishek Ghosh

Abhishek Ghosh is a Businessman, Surgeon, Author and Blogger. You can keep touch with him on Twitter - @AbhishekCTRL.

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About This Article

Cite this article as: Abhishek Ghosh, "IPv4 and IPv6 Details," in The Customize Windows, January 16, 2015, January 30, 2023, https://thecustomizewindows.com/2015/01/ipv4-ipv6-details/.

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