July 2002
Beginner
360 pages
11h 19m
English
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Address Notation
An IPv6 address has 128 bits, or 16 bytes. The address is divided into eight, 16-bit hexidecimal blocks, separated by colons. For example:
FE80:0000:0000:0000:0202:B3FF:FE1E:8329
To make life easier, some abbreviations are possible. For instance, leading zeros in a 16-bit block can be skipped. The example address now looks like:
FE80:0:0:0:202:B3FF:FE1E:8329
A double colon can replace consecutive zeros, or leading or trailing zeros, within the address. If we apply this rule, our address looks as follows:
FE80::202:B3FF:FE1E:8329
Note that the double colon can appear only once in an address. The
reason for this rule is that the computer always uses a full 128-bit
binary representation of the address, even if the displayed address
is simplified. When the computer finds a double colon, it expands it
with as many zeros as are needed to get 128 bits. If an address had
two double colons, the computer would not know how many zeros to add
for each. So the IPv6 address
CAFF:CA01:0000:0056:0000:ABCD:EF12:1234 can be
represented in the following ways (note the two possible positions
for the double colon):
CAFF:CA01:0000:0056:0000:ABCD:EF12:1234CAFF:CA01::56:0:ABCD:EF12:1234CAFF:CA01:0:56::ABCD:EF12:1234
In environments where
IPv4 and IPv6 nodes are
mixed, another convenient form of IPv6 address notation is to put the
values of an IPv4 address into the four low-order byte pieces of the
address. An IPv4 address of 192.168.0.2 can be
represented by x:x:x:x:x:x:192.168.0.2 ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.