AWS Solutions Architect/training/Section 5: Advanced Amazon VPC: Difference between revisions
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**12 host bits = 4096 addresses /20 subnet mask <ref>https://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing#IPv4_CIDR_blocks</ref> | **12 host bits = 4096 addresses /20 subnet mask <ref>https://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing#IPv4_CIDR_blocks</ref> | ||
**Cannot increase or decrease the size of your CIDR block once it's defined (You'd have to create and migrate to a new VPC) | **Cannot increase or decrease the size of your CIDR block once it's defined (You'd have to create and migrate to a new VPC) | ||
**Recommended to use RFC 1918 ranges <ref>The Internet Assigned Numbers Authority (IANA) has reserved the | **Recommended to use RFC 1918 ranges <ref>The Internet Assigned Numbers Authority (IANA) has reserved the following three blocks of the IP address space for private internets: | ||
<pre> | |||
10.0.0.0 - 10.255.255.255 (10/8 prefix) | 10.0.0.0 - 10.255.255.255 (10/8 prefix) | ||
172.16.0.0 - 172.31.255.255 (172.16/12 prefix) | 172.16.0.0 - 172.31.255.255 (172.16/12 prefix) | ||
192.168.0.0 - 192.168.255.255 (192.168/16 prefix) | 192.168.0.0 - 192.168.255.255 (192.168/16 prefix) | ||
</pre> | |||
We will refer to the first block as "24-bit block", the second as | |||
We will refer to the first block as "24-bit block", the second as | "20-bit block", and to the third as "16-bit" block. Note that (in | ||
pre-CIDR notation) the first block is nothing but a single class A | |||
network number, while the second block is a set of 16 contiguous | |||
class B network numbers, and third block is a set of 256 contiguous | |||
class C network numbers.</ref> | |||
**https://docs.aws.amazon.com/vpc/latest/userguide/subnet-sizing.html | **https://docs.aws.amazon.com/vpc/latest/userguide/subnet-sizing.html | ||
**Solarwinds has an interactive (not obvious) calculator https://www.solarwinds.com/free-tools/advanced-subnet-calculator | **Solarwinds has an interactive (not obvious) calculator https://www.solarwinds.com/free-tools/advanced-subnet-calculator and there's a similar calculator at https://www.site24x7.com/tools/ipv4-subnetcalculator.html | ||
*45. [HOL] Create a Custom VPC | *45. [HOL] Create a Custom VPC | ||
*46. VPC Routing Deep Dive | *46. VPC Routing Deep Dive | ||
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*56. [HOL] Create VPC Endpoint | *56. [HOL] Create VPC Endpoint | ||
{{References}} | |||