Description of problem:

Version-Release number of selected component:  OpenShift 4.14.33, 4.15.46

How reproducible:
every time

Steps to Reproduce:

1. configure node with additional network interface+net-attach-def+nncp

2. add pods to this node and use the additional network with an external DHCP

3. reboot node

Actual results:
The leased IP of the pod is not released and DHCP pool is filling-up.

Expected results:
a process should send a DHCP release packet.

Additional info:
I'm currently updating my lab to see the results on newer version

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Affected Platforms:

Is it an customer issue on-premise

If it is a customer / SD issue: 04096514

—
apiVersion: k8s.cni.cncf.io/v1
kind: NetworkAttachmentDefinition
metadata:
  name: dev2
  namespace: coucou
spec:
  config: '{"cniVersion": "0.3.1", "name": "dev2", "plugins": [ {"type": "macvlan", "master": "enp8s0", "ipam":

} ] }'

—
apiVersion: nmstate.io/v1
kind: NodeNetworkConfigurationPolicy
metadata:
  name: dev2
spec:
  desiredState:
    interfaces:
    - ipv4:
        dhcp: false
        enabled: false
      name: enp8s0
      state: up
      type: ethernet
  nodeSelector:
    br2: "true"
—
apiVersion: v1
kind: Pod
metadata:
  annotations:
    k8s.v1.cni.cncf.io/networks: |-
      [
       

      ]
  name: example
  labels:
    app: httpd
  namespace: coucou
spec:
  nodeSelector:
     br2: 'true'
  securityContext:
    runAsNonRoot: true
    seccompProfile:
      type: RuntimeDefault
  containers:
    - name: httpd
      image: 'image-registry.openshift-image-registry.svc:5000/openshift/httpd:latest'
      ports:
        - containerPort: 8080
      securityContext:
        allowPrivilegeEscalation: false
        capabilities:
          drop:
            - ALL
—
The pod should attempt to release its IP address back to the DHCP server to free up the IP pool, or at least reuse the same MAC address upon restart to avoid exhausting the DHCP pool