Posted on July 2, 2021 5:13 pm
 |  Asked by Andrew Conley
 |  167 views
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What is the minimum recommended size for the CVP Internal Cluster Network (overlay)?  I know it defaults to a /16, but that seems excessive for a 3 node cluster.  Can a smaller network size safely be specified?  I realize this is a private network that doesn’t need to be routed; it only needs to be accessible by the cluster interfaces, but would still like to specify a range that doesn’t overlap with other production networks.

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Posted by Tamas Plugor
Answered on July 2, 2021 5:27 pm

Hi Andrew,

The minimum subnet size is 20 for the k8s overlay.
You should make sure the subnet doesn't overlap with the CVP device and cluster interface subnets and any other subnets in the network. Some of us have been using 198.18.0.0/16 which is reserverd subnet for benchmarking (RFC5735/2544) which is not meant to be forwarded to the Internet.
There's now (since 2021.1.1) also a check in the config verifier script against 169.254/16, 127/8, 224/4 and 0/0 which wasn't there previously.

HTH,
Tamas

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