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Chapter 19. CIDR range definitions
You must specify non-overlapping ranges for the following CIDR ranges.
Machine CIDR ranges cannot be changed after creating your cluster.
OVN-Kubernetes, the default network provider in OpenShift Container Platform 4.11 to 4.13, uses the following IP address ranges internally:
100.64.0.0/16169.254.169.0/29fd98::/64fd69::/12519.1. Machine CIDR
In the Machine classless inter-domain routing (CIDR) field, you must specify the IP address range for machines or cluster nodes.
The default is
10.0.0.0/1619.2. Service CIDR
In the Service CIDR field, you must specify the IP address range for services. The range must be large enough to accommodate your workload. The address block must not overlap with any external service accessed from within the cluster. The default is
172.30.0.0/1619.3. Pod CIDR
In the pod CIDR field, you must specify the IP address range for pods.
The pod CIDR is the same as the
clusterNetwork10.128.0.0/1419.4. Host Prefix
In the Host Prefix field, you must specify the subnet prefix length assigned to pods scheduled to individual machines. The host prefix determines the pod IP address pool for each machine.
For example, if the host prefix is set to
/23/23/23
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