Network policy shows both v4 and v6 CIDR even though Cluster/instance and everything is v4

[vigneshsenapathy-hpe]

Amazon network policy endpoint shows that there is V4 and V6 cidr even though the Cluster/Instance/Pod and everything is v4. This is a day 1 issue and needs to be fixed the code should be more like if you have v6 enabled then the policy should have v6, if it doesnt have a v6 CIDR enabled network policy shouldn't have it and take over ports. VPC CNI 1.18.x has 24 open port limitation and if we add both v4 and v6 then you have 12 ports each

Example policy

apiVersion: networking.k8s.aws/v1alpha1 kind: PolicyEndpoint metadata: creationTimestamp: "2024-10-03T14:48:49Z" generateName: policy_name generation: 19 name: -vl8w4 namespace: default ownerReferences:

• apiVersion: networking.k8s.io/v1 blockOwnerDeletion: true controller: true kind: NetworkPolicy name: policy_name uid: 7f6a8d5b-5f5b-491f-8761-945f26094d8f resourceVersion: "221306648" uid: 5685a8f2-1e18-44db-8eab-87ad61198aa5 spec: egress:
• cidr: 0.0.0.0/0 ports:
  • port: 49 protocol: TCP
  • port: 53 protocol: TCP
  • port: 53 protocol: UDP
  • port: 443 protocol: TCP
  • port: 465 protocol: TCP
  • port: 514 protocol: TCP
  • port: 3306 protocol: TCP
  • port: 6379 protocol: TCP
• cidr: ::/0 ports:
  • port: 49 protocol: TCP
  • port: 53 protocol: TCP
  • port: 53 protocol: UDP
  • port: 443 protocol: TCP
  • port: 465 protocol: TCP
  • port: 514 protocol: TCP
  • port: 3306 protocol: TCP
  • port: 6379 protocol: TCP
• cidr:
• cidr:
• cidr: ingress:
• cidr:
• cidr: 0.0.0.0/0 ports:
  • port: 7000 protocol: TCP
  • port: 8080 protocol: TCP
• cidr: ::/0 ports:
  • port: 7000 protocol: TCP
  • port: 8080 protocol: TCP
• cidr:
• cidr: podIsolation:
• Ingress
• Egress podSelector: matchLabels: orch: name podSelectorEndpoints:
• hostIP: name: namespace: default podIP:
• hostIP: name: namespace: default podIP: policyRef: name: namespace: default

Thanks,

Vignesh

[haouc]

@vigneshsenapathy-hpe thanks for reporting this issue. We will look into this and keep you updated.