Intermediate Security Groups
This tutorial is part of the Cloud Two Series.
Back to Cloud TwoCategory: Intermediate
Difficulty: 2 out of 5
Duration: 37 minutes
1. Overview
2. Creating Security Groups
3. Allow connections by IP address
4. Allow connections by Security Groups
5. OpenStack CLI
6. Next Steps
Find a mistake? Let us know the issue here.
Allow connections by IP address
To specify a single IP address or a range of IP addresses for a security
group rule, you would choose CIDR for the Remote option.
CIDR (or Classless inter-domain routing) notation is a method of representation
of IP addresses. It is made up of two parts, the first being an IP address,
followed by a slash (/) and a number indicating how many bits of the address
are used to define the network.
Some common options might be:
- 0.0.0.0/0 To allow access to any available IP address. This is potentially risky and should generally be avoided if possible.
- 192.168.1.0/24 To allow any IP address between
192.168.1.1and192.168.1.254. - 10.1.2.3/32 To allow the single IP address
10.1.2.3. The/32component is used for identifying a single IPv4 address.