VPC CNI v1.20.4-eksbuild.2 issue on eks v1.34

[s-marinkovic]

What happened:

After upgrading EKS to v1.34 and vpc-cni plugin to "v1.20.4-eksbuild.2" we are seeing a lot of errors in our cluster:
**FailedCreatePodSandBox**: Failed to create pod sandbox: rpc error: code = Unknown desc = failed to setup network for sandbox "xxxxxx": plugin type="aws-cni" name="aws-cni" failed (add): add command: failed to setup network: SetupPodNetwork: failed to setup veth pair: failed to generate Unique MAC addr for host side veth: results may be incomplete or inconsistent

Attach logs

What you expected to happen:

How to reproduce it (as minimally and precisely as possible):

• Update to EKS 1.34
• Update vpc-cni to v1.20.4-eksbuild.2

Anything else we need to know?:

Environment:

• Kubernetes version (use kubectl version): v1.34.1-eks-3025e55
• CNI Version v1.20.4-eksbuild.2
• OS (e.g: cat /etc/os-release): bottlerocket

[calumgilchristfirstup]

This has been fixed but not yet released: #3460

Will be in 1.20.5 according to: #3460 (comment)

Reverting to 1.19 fixed it for us.

[jaydeokar]

Closing this as we already have a github issue open for this and we are in process of a release with the fix

[github-actions]

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