September 2018
Beginner to intermediate
174 pages
3h 27m
English
Content preview from Designing AWS Environments
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IPv4
VPCs on AWS use version 4 of the Internet Protocol, known as IPv4. We can assign the IPv6 CIDR block to our VPC, and assign IPv6 CIDR blocks to our subnets. An IPv4 address is defined using 32 bits, broken up into four parts (4x8 bits). Each part is 8 bits, and so their values range from 0 to 255. So, an IP address can be anywhere from 0.0.0.0 to 255.255.255.255. This means that the total number of IP addresses available globally is 2 to the 32 power, or 4,294,967,296, so basically just under 4.3 billion. CIDR notation makes it easy to specify a range of IP addresses by appending a slash and the number of fixed bits, from 0 to 32, after the address. It is easiest to explain this by an example (/24, /28).
By default, Amazon EC2 and Amazon ...
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