Summary
RFC 1918 addresses are to be used for private IPv4 addresses within the cloud and on-premises. These addresses are not routable to the public Internet.
References
IPv6 Addresses
These notes are from "IPv6 Addresses".
IPv6 Glossary
- BYOIP: Bring Your Own IP. IPv6 requires a prefix of /48 or larger.
- DRG: dynamic routing gateway which is used to route private traffic between a VCN and an on-premise network.
- dual-stack: support IPv4 and, optionally, IPv6.
- GUA: global unicast address. OCI uses /56 prefix.
- LPG: local peering gateway which is used to route traffic between VCNs.
- ULA: unique local address. This prefix is internally routable within your OCI network, and is equivalent to IPv4 private addressing. With ULA, you can assign a /64 prefix or larger to a VCN. The prefix is /64 or larger.
IPv6 Notes
Each IPv6 address is 128 bits long and is written as hexadecimal digits in eight (8) blocks of four (4) digits separated by colons (':'). Consectitive blocks of zeroes can be replaced by two (2) colons ('::'). Only one (1) such abbreviation can be written in an address.
IPv4 Notes
Each IPv4 address is 32 bits long and is written as decimal digits in four (4) blocks separated by periods ('.'). Each block is a number between zero (0) and 255.
RFC 1918 (p.4):
| Prefix | Mask | IP Address Range | Description |
|---|---|---|---|
| 10.0.0.0/8 | 255.0.0.0 | 10.0.0.0 to 10.255.255.255 | Class A network |
| 172.16.0.0/12 | 255.240.0.0 | 172.16.0.0 to 172.31.255.255 | 16 class B networks |
| 192.168.0.0/16 | 255.255.0.0 | 192.168.0.0 to 192.168.255.255 | 256 class C networks |
OCI requires VCN size ranges from /16 (64K - 3 hosts) to /30 (1 host).