What Is Ipv4 Ipv6

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IPv4 vs. IPv6 Benefits - What is it? | ThousandEyes

IPv4 vs. IPv6 Benefits – What is it? | ThousandEyes

What is IPv6?
IPv6 is the next generation Internet Protocol (IP) address standard intended to supplement and eventually replace IPv4, the protocol many Internet services still use today. Every computer, mobile phone, home automation component, IoT sensor and any other device connected to the Internet needs a numerical IP address to communicate between other devices. The original IP address scheme, called IPv4, is running out of addresses due to its widespread usage from the proliferation of so many connected devices.
What is IPv4?
IPv4 stands for Internet Protocol version 4. It is the underlying technology that makes it possible for us to connect our devices to the web. Whenever a device accesses the Internet, it is assigned a unique, numerical IP address such as 99. 48. 227. To send data from one computer to another through the web, a data packet must be transferred across the network containing the IP addresses of both devices.
Why Support IPv6? What are the benefits of IPv6?
IPv6 (Internet Protocol version 6) is the sixth revision to the Internet Protocol and the successor to IPv4. It functions similarly to IPv4 in that it provides the unique IP addresses necessary for Internet-enabled devices to communicate. However, it does have one significant difference: it utilizes a 128-bit IP address.
Key benefits to IPv6 include:
No more NAT (Network Address Translation)
Auto-configuration
No more private address collisions
Better multicast routing
Simpler header format
Simplified, more efficient routing
True quality of service (QoS), also called “flow labeling”
Built-in authentication and privacy support
Flexible options and extensions
Easier administration (no more DHCP)
IPv4 uses a 32-bit address for its Internet addresses. That means it can provide support for 2^32 IP addresses in total — around 4. 29 billion. That may seem like a lot, but all 4. 29 billion IP addresses have now been assigned, leading to the address shortage issues we face today.
IPv6 utilizes 128-bit Internet addresses. Therefore, it can support 2^128 Internet addresses—340, 282, 366, 920, 938, 463, 463, 374, 607, 431, 768, 211, 456 of them to be exact. The number of IPv6 addresses is 1028 times larger than the number of IPv4 addresses. So there are more than enough IPv6 addresses to allow for Internet devices to expand for a very long time.
The text form of the IPv6 address is xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx, where each x is a hexadecimal digit, representing 4 bits. Leading zeros can be omitted. The double colon (::) can be used once in the text form of an address, to designate any number of 0 bits.
With Dual-IP stacks, your computers, routers, switches, and other devices run both protocols, but IPv6 is the preferred protocol. A typical procedure for businesses is to start by enabling both TCP/IP protocol stacks on the wide area network (WAN) core routers, then perimeter routers and firewalls, followed by data-center routers and finally the desktop access routers.
ThousandEyes Support for IPv6
With IPv6 becoming more prevalent in cloud provider and consumer access networks, you may already be on the path to IPv6 deployment with your network and applications.
If you are looking to understand IPv6 in your environment there are three things you should be monitoring:
IPv6 DNS resolution
IPv6 traffic paths
IPv6 BGP prefixes and routes
ThousandEyes has support for IPv6 so that organizations can utilize IPv6 across all of their test types (web, network, voice, routing) and agent types (cloud, enterprise, endpoint).
ThousandEyes Cloud Agent support for IPv6 is provided on six continents allowing global coverage for organizations. ThousandEyes also supports the use of dual-stack IPv4 and IPv6 Enterprise Agents. Enterprise Agents can have both addresses assigned and executes tests based on a user-defined preference for only IPv4, only IPv6 or a preference for IPv6.
IPv4 vs IPv6 - javatpoint

IPv4 vs IPv6 – javatpoint

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What is IP?
An IP stands for internet protocol. An IP address is assigned to each device connected to a network. Each device uses an IP address for communication. It also behaves as an identifier as this address is used to identify the device on a network. It defines the technical format of the packets. Mainly, both the networks, i. e., IP and TCP, are combined together, so together, they are referred to as a TCP/IP. It creates a virtual connection between the source and the destination.
We can also define an IP address as a numeric address assigned to each device on a network. An IP address is assigned to each device so that the device on a network can be identified uniquely. To facilitate the routing of packets, TCP/IP protocol uses a 32-bit logical address known as IPv4(Internet Protocol version 4).
An IP address consists of two parts, i. e., the first one is a network address, and the other one is a host address.
There are two types of IP addresses:
IPv4
IPv6
What is IPv4?
IPv4 is a version 4 of IP. It is a current version and the most commonly used IP address. It is a 32-bit address written in four numbers separated by ‘dot’, i. e., periods. This address is unique for each device.
For example, 66. 94. 29. 13
The above example represents the IP address in which each group of numbers separated by periods is called an Octet. Each number in an octet is in the range from 0-255. This address can produce 4, 294, 967, 296 possible unique addresses.
In today’s computer network world, computers do not understand the IP addresses in the standard numeric format as the computers understand the numbers in binary form only. The binary number can be either 1 or 0. The IPv4 consists of four sets, and these sets represent the octet. The bits in each octet represent a number.
Each bit in an octet can be either 1 or 0. If the bit the 1, then the number it represents will count, and if the bit is 0, then the number it represents does not count.
Representation of 8 Bit Octet
The above representation shows the structure of 8- bit octet.
Now, we will see how to obtain the binary representation of the above IP address, i. e., 66. 13
Step 1: First, we find the binary number of 66.
To obtain 66, we put 1 under 64 and 2 as the sum of 64 and 2 is equal to 66 (64+2=66), and the remaining bits will be zero, as shown above. Therefore, the binary bit version of 66 is 01000010.
Step 2: Now, we calculate the binary number of 94.
To obtain 94, we put 1 under 64, 16, 8, 4, and 2 as the sum of these numbers is equal to 94, and the remaining bits will be zero. Therefore, the binary bit version of 94 is 01011110.
Step 3: The next number is 29.
To obtain 29, we put 1 under 16, 8, 4, and 1 as the sum of these numbers is equal to 29, and the remaining bits will be zero. Therefore, the binary bit version of 29 is 00011101.
Step 4: The last number is 13.
To obtain 13, we put 1 under 8, 4, and 1 as the sum of these numbers is equal to 13, and the remaining bits will be zero. Therefore, the binary bit version of 13 is 00001101.
Drawback of IPv4
Currently, the population of the world is 7. 6 billion. Every user is having more than one device connected with the internet, and private companies also rely on the internet. As we know that IPv4 produces 4 billion addresses, which are not enough for each device connected to the internet on a planet. Although the various techniques were invented, such as variable- length mask, network address translation, port address translation, classes, inter-domain translation, to conserve the bandwidth of IP address and slow down the depletion of an IP address. In these techniques, public IP is converted into a private IP due to which the user having public IP can also use the internet. But still, this was not so efficient, so it gave rise to the development of the next generation of IP addresses, i. e., IPv6.
What is IPv6?
IPv4 produces 4 billion addresses, and the developers think that these addresses are enough, but they were wrong. IPv6 is the next generation of IP addresses. The main difference between IPv4 and IPv6 is the address size of IP addresses. The IPv4 is a 32-bit address, whereas IPv6 is a 128-bit hexadecimal address. IPv6 provides a large address space, and it contains a simple header as compared to IPv4.
It provides transition strategies that convert IPv4 into IPv6, and these strategies are as follows:
Dual stacking: It allows us to have both the versions, i. e., IPv4 and IPv6, on the same device.
Tunneling: In this approach, all the users have IPv6 communicates with an IPv4 network to reach IPv6.
Network Address Translation: The translation allows the communication between the hosts having a different version of IP.
This hexadecimal address contains both numbers and alphabets. Due to the usage of both the numbers and alphabets, IPv6 is capable of producing over 340 undecillion (3. 4*1038) addresses.
IPv6 is a 128-bit hexadecimal address made up of 8 sets of 16 bits each, and these 8 sets are separated by a colon. In IPv6, each hexadecimal character represents 4 bits. So, we need to convert 4 bits to a hexadecimal number at a time
Address format
The address format of IPv4:
The address format of IPv6:
The above diagram shows the address format of IPv4 and IPv6. An IPv4 is a 32-bit decimal address. It contains 4 octets or fields separated by ‘dot’, and each field is 8-bit in size. The number that each field contains should be in the range of 0-255. Whereas an IPv6 is a 128-bit hexadecimal address. It contains 8 fields separated by a colon, and each field is 16-bit in size.
Differences between IPv4 and IPv6
Ipv4
Ipv6
Address length
IPv4 is a 32-bit address.
IPv6 is a 128-bit address.
Fields
IPv4 is a numeric address that consists of 4 fields which are separated by dot (. ).
IPv6 is an alphanumeric address that consists of 8 fields, which are separated by colon.
Classes
IPv4 has 5 different classes of IP address that includes Class A, Class B, Class C, Class D, and Class E.
IPv6 does not contain classes of IP addresses.
Number of IP address
IPv4 has a limited number of IP addresses.
IPv6 has a large number of IP addresses.
VLSM
It supports VLSM (Virtual Length Subnet Mask). Here, VLSM means that Ipv4 converts IP addresses into a subnet of different sizes.
It does not support VLSM.
Address configuration
It supports manual and DHCP configuration.
It supports manual, DHCP, auto-configuration, and renumbering.
Address space
It generates 4 billion unique addresses
It generates 340 undecillion unique addresses.
End-to-end connection integrity
In IPv4, end-to-end connection integrity is unachievable.
In the case of IPv6, end-to-end connection integrity is achievable.
Security features
In IPv4, security depends on the application. This IP address is not developed in keeping the security feature in mind.
In IPv6, IPSEC is developed for security purposes.
Address representation
In IPv4, the IP address is represented in decimal.
In IPv6, the representation of the IP address in hexadecimal.
Fragmentation
Fragmentation is done by the senders and the forwarding routers.
Fragmentation is done by the senders only.
Packet flow identification
It does not provide any mechanism for packet flow identification.
It uses flow label field in the header for the packet flow identification.
Checksum field
The checksum field is available in IPv4.
The checksum field is not available in IPv6.
Transmission scheme
IPv4 is broadcasting.
On the other hand, IPv6 is multicasting, which provides efficient network operations.
Encryption and Authentication
It does not provide encryption and authentication.
It provides encryption and authentication.
Number of octets
It consists of 4 octets.
It consists of 8 fields, and each field contains 2 octets. Therefore, the total number of octets in IPv6 is 16.
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IPv4 vs. IPv6: What's the Difference? | Avast

IPv4 vs. IPv6: What’s the Difference? | Avast

IPv4: a brief history
Before we get into the differences between the two IP address protocols, what’s IPv4? Well, an IP address is a string of numbers that is assigned to a device to identify it on the internet. It is an address, just as the number and street of your home is an address. While your home address is used to send you mail, your IP address is used to send packets of data that you request.
Internet Protocol version 4, generally referred to as IPv4, was developed in the early 1980s. An IPv4 address comprises four numbers, each ranging from 0 to 255, which are separated by periods. For example, Avast’s IP address is 5. 62. 42. 77. There is more to IP addresses, and it helps to understand the essentials of TCP/IP as well, but these are the basics.
Every website has an IP address; we just don’t use them anymore, typically. In the early days of the internet, it was necessary to know a website’s IP address in order to navigate to it. Then, the Domain Name Service (DNS) came along, which translates numbers into names. So when you type in “ the DNS translates that back to 5. This enables us to navigate the web much more conveniently, as it’s much easier to recall a website’s name than its IP address.
Have we run out of IPv4 addresses?
IPv4 has a theoretical limit of 4. 3 billion addresses, and in 1980, that was more than enough. But as the internet grew and went global, we quickly ran out of addresses, especially in today’s era of smartphones and IoT devices.
The internet has been running out of IPv4 addresses since the 1990s. While clever engineers have found ways around the problem, it wasn’t long before a more permanent fix became the goal. Developed to solve these capacity issues for good, IPv6 was needed when IPv4 could no longer support the load.
At present, IPv4 coexists on the internet with its newer version, though eventually, everything will use IPv6. Replacing old IPv4 equipment would be prohibitively expensive and disruptive, and so IPv6 is being slowly rolled out as older IPv4 hardware is retired.
IPv6: the future of the web?
Internet Protocol version 6, or IPv6, was first introduced in the late 1990s as a replacement for IPv4. Even then the builders of the internet realized IPv4’s limitations and the eventual shortage.
IPv6 uses 128-bit addresses, allowing for a theoretical 340, 282, 366, 920, 938, 463, 463, 374, 607, 431, 768, 211, 456, or 340 undecillion addresses. IPv6 addresses are represented as eight groups of four hexadecimal digits, with the groups being separated by colons. One example might be “2002:0de6:0001:0042:0100:8c2e:0370:7234, ” but methods to abbreviate this full notation exist.
In addition to increasing the supply of IP addresses, IPv6 also addressed IPv4’s many shortcomings — chief among them being security, which we’ll delve into more later.
IPv4 vs. IPV6
The advent of IPv6 brought more functionality, in addition to more IP addresses. For example, IPv6 supports multicast addressing, which allows bandwidth-intensive packet flows (such as multimedia streams) to be sent to multiple destinations simultaneously, reducing network bandwidth. But is IPv6 better than IPv4? Let’s find out.
IPv6 has a new feature called autoconfiguration, which allows a device to generate an IPv6 address as soon as it powers up and puts itself on the network. The device begins by looking for an IPv6 router. If one is present, the device can generate a local address and a globally routable address, allowing access to the wider internet. In IPv4-based networks, the process of adding devices often has to be done manually.
IPv6 allows devices to stay connected to several networks simultaneously. This is due to interoperability and configuration capabilities that enable the hardware to automatically assign multiple IP addresses to the same device.
Next, we examine the differences between IPv4 and IPv6 through the lenses of speed and security.
IPv4 vs. IPv6: Speed comparison
How do IPv4 and IPv6 compare when it comes to speed? The security blog Sucuri ran a series of tests in which they found that in direct connections, IPv4 and IPv6 delivered the same speed. IPv4 occasionally won the test.
In theory, IPv6 should be a little faster since cycles don’t have to be wasted on NAT translations. But IPv6 also has larger packets, which may make it slower for some use cases. What really makes a difference at this point is that IPv4 networks are mature and thus highly optimized, more so than IPv6 networks. So with time and tuning, IPv6 networks will get faster.
IPv4 vs. IPv6: Security comparison
IPv6 was built with more security in mind. IP Security (IPSec) is a series of IETF security protocols for security, authentication, and data integrity, and it’s fully integrated into IPv6. The thing is, IPSec can also be fully integrated into IPv4. It’s up to ISPs to implement it — and not all companies do.
IPv6 Security
IPv6 is designed for end-to-end encryption, so in theory, widespread adoption of IPv6 will make man-in-the-middle attacks significantly more difficult.
IPv6 also supports more-secure name resolution. The Secure Neighbor Discovery (SEND) protocol adds a security extension to the Neighbor Discovery Protocol (NDP), which handles discovery of other network nodes on a local link. By default, NDP is not secure, so it can be susceptible to malicious interference. SEND secures NDP with a cryptographic method that is independent of IPsec.
Thanks to native IPSec, IPv6 provides two security headers which can be used separately or together: the Authentication Header (AH) and Encapsulating Security Payload (ESP). Authentication Header provides data-origin authentication and protection against replay attacks, while ESP delivers connectionless integrity, data-origin authentication, protection against replay attacks, and limited traffic flow confidentiality, as well as privacy and confidentiality through encryption of the payload. IPv4 can also have this protection if IPSec is implemented on the network.
IPv4 Security
IPv4 has been significantly updated over the years, so the difference between IPv4 and IPv6 security is not extraordinary. The same IPSec in IPv6 is now available for IPv4; it’s up to network providers and end users alike to embrace and use it — so a properly configured IPv4 network can be as secure as an IPv6 network.
Avast SecureLine VPN is currently compatible only with IPv4, but keeps your IP completely hidden with bank-grade encryption to maintain safety and anonymity online.
Additional benefits of IPv6
IPv6 allows for binding a public signature key — one-half of an asymmetric encryption system, the other being the private key — to an IPv6 address. The resulting Cryptographically Generated Address allows the user to demonstrate “proof of ownership” for a particular IPv6 address and validate their identity. It is impossible to retrofit this functionality to IPv4 with the current 32-bit address space constraint.
The new protocol also enables end-to-end connectivity at the IP layer by eliminating the need for Network Address Translation (NAT) — one of the workarounds designed to conserve IPv4 addresses. This transition opens the door for new and valuable services. Peer-to-peer networks are easier to create and maintain, and services such as VoIP and Quality of Service (QoS) become more robust.
Also, IPv6 brings the ability to belong to many networks simultaneously, with a unique address on each network, and the ability to combine multiple enterprise networks without readdressing.
Ultimately: Is IPv6 better? Usually, but not always. If you’re asking yourself, “Should I use IPv6? ” read on before making your decision.
How to disable IPv6 on Windows, Mac, and Linux
Since very few VPN services support IPv6, IPv6 traffic on your physical NIC may leak information about your online activity or your hardware MAC address. For that reason, if your ISP does support IPv6, but you use a VPN like SecureLine VPN, you should disable IPv6 on your system.
The first thing to do is determine if your ISP supports IPv6. Comcast most notably does and makes a lot of noise about it. However, plenty of big-name ISPs do not, such as Spectrum (which you may know as Time Warner or Road Runner). This site will help you determine if your ISP supports it.
If the IPv6 connectivity test says “Not supported, ” then you are OK and your IPv6 address isn’t leaking. Spectrum falls into this category. If the test for IPv6 connectivity says “Supported, ” then you should consider disabling the IPv6 in your operating system.
Instructions for disabling IPv6 are available for Windows, MacOS, and Linux.
Why don’t we switch to IPv6 permanently?
We will, in time. Legacy technologies take a long time to die off, and the switch to a replacement is never as fast as its supporters would prefer. There will be a permanent migration to IPv6, but it will take decades to achieve. The Internet Society reported last year that there are 24 countries in the world where IPv6 totals more than 15% of overall IP traffic, and 49 that have topped the 5% threshold. So migration from IPv4 to IPv6 is progressing very slowly.
How to Protect your IP address
Why protect your IP address? With your location showing, you expose yourself to a variety of security and privacy issues, such as:
Packet sniffing: Hackers can observe your IP traffic to find out sensitive information about you such as your online banking activity.
Surveillance: Your ISP, snoops, and even governments can spy on your web Websites can see your location and discriminate against you based on it. They can block content and even raise prices.
Avast SecureLine VPN hides your IP address and anonymizes your online activity to keep you safe online. Take back your online privacy in just one click.

Frequently Asked Questions about what is ipv4 ipv6

What is difference between IPv4 and IPv6?

The main difference between IPv4 and IPv6 is the address size of IP addresses. The IPv4 is a 32-bit address, whereas IPv6 is a 128-bit hexadecimal address. IPv6 provides a large address space, and it contains a simple header as compared to IPv4.

Which is faster IPv4 or IPv6?

IPv4 occasionally won the test. In theory, IPv6 should be a little faster since cycles don’t have to be wasted on NAT translations. But IPv6 also has larger packets, which may make it slower for some use cases. … So with time and tuning, IPv6 networks will get faster.May 8, 2020

Should I enable IPv4 or IPv6?

Switching from IPv4 to IPv6 will give the Internet a much larger pool of IP addresses. It should also allow every device to have its own public IP address, rather than be hidden behind a NAT router.Sep 22, 2016

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