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# rke2a
adamant-kite-43734
10/03/2023, 5:24 PMThis message was deleted.
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miniature-salesclerk-33951
10/03/2023, 9:23 PMWhat CNI? Looks like flannel, calico, canal, and cilium should automatically grok it. Calico has some extra concerns about it though (uses BGP instead of VXLAN).
Looks like you might need to add the IPv6 subnets for the cluster-cidr and service-cidr in the rke2 config, though.
https://docs.rke2.io/install/network_options#dual-stack-configuration
miniature-salesclerk-33951
10/03/2023, 9:30 PMIn the Rancher UI, it says the cluster CIDR can't be changed after the cluster is created (in the form), but still appears to be editable in the yaml view, so you might want to get a second opinion about this and not take my word for it 🙂
c
careful-table-97595
10/04/2023, 2:39 AMI'm using Canal. Also using Multus but only v4 addresses for it.
I guess I could try to spin up a test cluster on a virtual environment with v4 only and then see what happens if I add the ipv6 info to it.
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m
miniature-salesclerk-33951
10/05/2023, 12:12 AMI think it should be OK to add to but not otherwise change it. But I'm not at all confident in that.
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