Hackers steal McDonald's customer data |
- Hackers steal McDonald's customer data
- Google, Microsoft ad networks briefly hit by with malware
- Military Ban Goes Too Far...and Not Far Enough
- Something Wiki this way comes
- Important Points to Know About IPV6
| Hackers steal McDonald's customer data Posted: 11 Dec 2010 08:00 AM PST
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| Google, Microsoft ad networks briefly hit by with malware Posted: 11 Dec 2010 08:00 AM PST
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| Military Ban Goes Too Far...and Not Far Enough Posted: 10 Dec 2010 08:00 AM PST
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| Posted: 10 Dec 2010 08:00 AM PST
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| Important Points to Know About IPV6 Posted: 11 Dec 2010 01:37 AM PST
We are slowly approaching the implementation of IPv6 in a mass scale and thus we must be ready to learn some significant differences over IPv4. Also, some IP addressing terms will start to appear with increasing frequency in our day to day work. So let's see some notable concepts that you need to know about IPv6. – IPv6 addresses are 128 bits long and are expressed in hexadecimal numbers. – IPv4 addresses are 32 bits long and are represented as four octets separated by periods. Each octet of the address is represented in decimal, taking a possible value between 0 and 255. – IPv6 addresses are 128 bits long and are expressed in hexadecimal numbers. Every four hexadecimal characters are separated by a colon. – IPv6 uses different IP address types. One of those types is the link local address that configures itself at every interface that has enabled the IPv6 protocol. The local link interface addresses always begin with FE80. – Similarly, multicast addresses always start with FF0x (the x represents a hexadecimal digit letter between 1 and 8). – Zeros at the beginning of each portion of the address may be deleted. IPv6 addresses are expressed as 32 hexadecimal digits separated into 8 groups of 4 digits separated by a colon. When one of these 8 groups of digits begins with zero, it can be eliminated. For example: If we delete the zeros at the beginning of each section the address becomes: – When there are zeros in several positions, they may also be deleted. For example: In this scenario we can eliminate consecutive groups of zeros and also suppress leading zeros in some groups. Thus, the address becomes: The double colon expression :: tells the operating system that everything between them are all zeros. You must be careful because you can delete an entire section only when fully made up with zeros. Also remember that the double colon expression :: can be used only once in each IP address representation. – There is only one loopback address. IPv4 has reserved the entire network 127.0.0.0 / 8 (it is customary to use address 127.0.0.1) as the loopback address to point to the local machine. In IPv6 there is also a loopback address, but in this case is only one and represented with :: 1 Or to put it in the conventional way (full format): – No subnet mask is needed. – DNS service is also available in IPv6. – IPv6 addresses can connect over IPv4 networks. – Many vendors are already able to use IPv6. – Windows support for IPv6 has some peculiarities. http://172.16.100.1:8543 In IPv6, as the colon is part of the description of the IP address, the IP and Port separation is done using square brackets: http:// [FE80: CD00: 0: CDE: 1234:0:2567:9AB]: 8543 This format is not supported on Windows machines because when you use colons this is interpreted as referencing an internal drive in the computer. To solve this problem, Microsoft has established a special domain for the IPv6 address representation in Windows machines. In this way, if you reference an IPv6 address using Universal Naming Convention, the digits must be separated by dashes instead of colons and at the end of the address you must add the domain name "ipv6-literal.net". An example, instead of: You should use: |
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