Benefits of IPv6 IPv6的好處 <<
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IPv6 Address Structure IPv6地址結構
While IPv6 has numerous improvements over IPv4, the most notable thing about IPv6 that people see is the format of the address. Instead of the dotted-decimal notation we used in IPv4 with addresses like 192.168.1.1, IPv6 uses eight groupings of four hexadecimal digits in each group. Each group is then broken apart by a colon (:). An example of an IPv6 address is 2002:0000:0000:0000:0000:0000:4815:54ae.
儘管IPv6相對於IPv4進行了許多改進，但是人們看到的關於IPv6的最值得注意的事情是地址的格式。 IPv6不是在IPv4中使用像192.168.1.1這樣的地址使用的點分十進製表示法，而是在每個組中使用四個十六進制數字組成的八組。 然後，每個組用冒號（:)分隔。 IPv6地址的示例是2002：0000：0000：0000：0000：0000：0000：4815：54ae。
A hexadecimal digit allows for counting from zero to 15 using the digits 0-9, then the letters A through F. Each hexadecimal digit replaces four binary digits (or four 1s and 0s), allowing us to write an IPv6 address using (at most) 32 hexadecimal digits.
十六進制數字允許使用數字0-9從0到15進行計數，然後使用字母A至F。每個十六進制數字都替換了四個二進制數字（或四個1和0），從而使我們可以使用（最多為 ）32個十六進制數字。
Luckily, the creators of IPv6 allowed for a shorthand. First, anytime there are leading zeros, they can be dropped. This is equivalent to dropping the leading zeros in the number 0010 to 10. The numbers are equivalent, as long as the zeros are in front of the other digits. The second shorthand technique involves several groupings of four zeros. When multiple groupings of four zeros are present, they can be represented by a double colon (::). Note that you can only use the double colon once per address, because the only way to know how many sets of zeros you’ve replaced with the double colon is to compare the shorthand address with the total number of bits available.
幸運的是，IPv6的創建者允許使用簡寫形式。 首先，只要有前導零，就可以將其丟棄。 這等效於將數字0010中的前導零刪除為10。這些數字是等效的，只要零在其他數字的前面即可。 第二種速記技術涉及四個零的幾個分組。 當存在四個零的多個分組時，可以用雙冒號（：:)表示。 請注意，每個地址只能使用雙冒號一次，因為要知道用雙冒號替換了多少個零集的唯一方法是將速記地址與可用位數進行比較。
