cni: add ipv6/dual-stack support for calico cni #22065

kartikjoshi21 · 2025-12-08T08:14:00Z

cni: add ipv6/dual-stack support for calico cni

This is final PR which enables ipv6 completely with calico cni.

…ane alias

k8s-ci-robot · 2025-12-08T08:14:07Z

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k8s-ci-robot · 2025-12-08T08:14:10Z

Hi @kartikjoshi21. Thanks for your PR.

I'm waiting for a github.com member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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kartikjoshi21 · 2025-12-08T08:14:32Z

Logs:

kartikjoshi@kartikjoshiwindows:~/minikube-ipv6-support/minikube$ minikube delete -p calico-v4 --all --purge

./out/minikube start -p calico-v4 \
  --driver=docker \
  --ip-family=ipv4 \
  --cni=calico \
  --service-cluster-ip-range=10.96.0.0/12 \
  --pod-cidr=10.244.0.0/16
🔥  Successfully deleted all profiles
💀  Successfully purged minikube directory located at - [/home/kartikjoshi/.minikube]
📌  Kicbase images have not been deleted. To delete images run:
    ▪ docker rmi gcr.io/k8s-minikube/kicbase:v0.0.48 gcr.io/k8s-minikube/kicbase:v0.0.47
😄  [calico-v4] minikube v1.37.0 on Ubuntu 24.04 (kvm/amd64)
✨  Using the docker driver based on user configuration
📌  Using Docker driver with root privileges
👍  Starting "calico-v4" primary control-plane node in "calico-v4" cluster
🚜  Pulling base image v0.0.48-1763789673-21948 ...
💾  Downloading Kubernetes v1.34.1 preload ...
    > preloaded-images-k8s-v18-v1...:  337.01 MiB / 337.01 MiB  100.00% 3.32 Mi
🔥  Creating docker container (CPUs=2, Memory=3072MB) ...
🐳  Preparing Kubernetes v1.34.1 on Docker 29.0.2 ...
🔗  Configuring Calico (Container Networking Interface) ...
🔎  Verifying Kubernetes components...
    ▪ Using image gcr.io/k8s-minikube/storage-provisioner:v5
🌟  Enabled addons: storage-provisioner, default-storageclass
🏄  Done! kubectl is now configured to use "calico-v4" cluster and "default" namespace by default


kartikjoshi@kartikjoshiwindows:~/minikube-ipv6-support/minikube$ kubectl get ippools.crd.projectcalico.org

kubectl get ippool default-ipv4-ippool -o yaml | sed -n '1,40p'
NAME                  AGE
default-ipv4-ippool   8h
apiVersion: crd.projectcalico.org/v1
kind: IPPool
metadata:
  annotations:
    projectcalico.org/metadata: '{"creationTimestamp":"2025-12-05T09:30:08Z"}'
  creationTimestamp: "2025-12-05T09:30:08Z"
  generation: 1
  name: default-ipv4-ippool
  resourceVersion: "732"
  uid: 10c91ec2-add7-423c-8a37-32e21408203a
spec:
  allowedUses:
  - Workload
  - Tunnel
  assignmentMode: Automatic
  blockSize: 26
  cidr: 10.244.0.0/16
  ipipMode: Always
  natOutgoing: true
  nodeSelector: all()
  vxlanMode: Never


kartikjoshi@kartikjoshiwindows:~/minikube-ipv6-support/minikube$ kubectl run v4test --image=nginx:stable --restart=Never
kubectl wait pod v4test --for=condition=Ready --timeout=90s
kubectl exec v4test -- ip -4 addr show dev eth0
kubectl exec v4test -- ip -6 addr show dev eth0 || true
pod/v4test created
pod/v4test condition met

kartikjoshi@kartikjoshiwindows:~/minikube-ipv6-support/minikube$ kubectl get pod v4test -o wide
kubectl get pod v4test -o jsonpath='{.status.podIP}{"\n"}'
kubectl get pod v4test -o jsonpath='{.status.podIPs[*].ip}{"\n"}'
NAME     READY   STATUS    RESTARTS   AGE   IP             NODE        NOMINATED NODE   READINESS GATES
v4test   1/1     Running   0          10m   10.244.159.3   calico-v4   <none>           <none>
10.244.159.3
10.244.159.3

kartikjoshi@kartikjoshiwindows:~/minikube-ipv6-support/minikube$ ./out/minikube start -p calico-v6   --driver=docker   --ip-family=ipv6   --cni=calico   --service-cluster-ip-range-v6=fd00:210::/108   --pod-cidr-v6=fd11:33::/64
😄  [calico-v6] minikube v1.37.0 on Ubuntu 24.04 (kvm/amd64)
✨  Using the docker driver based on user configuration
📌  Using Docker driver with root privileges
💡  If Docker daemon IPv6 is disabled, enable it in /etc/docker/daemon.json and restart:
  {"ipv6": true, "fixed-cidr-v6": "fd00:55:66::/64"}
👍  Starting "calico-v6" primary control-plane node in "calico-v6" cluster
🚜  Pulling base image v0.0.48-1763789673-21948 ...
💾  Downloading Kubernetes v1.34.1 preload ...
    > preloaded-images-k8s-v18-v1...:  337.01 MiB / 337.01 MiB  100.00% 3.84 Mi
🔥  Creating docker container (CPUs=2, Memory=3072MB) ...
🐳  Preparing Kubernetes v1.34.1 on Docker 29.0.2 ...
🔗  Configuring Calico (Container Networking Interface) ...
🔎  Verifying Kubernetes components...
    ▪ Using image gcr.io/k8s-minikube/storage-provisioner:v5
🌟  Enabled addons: storage-provisioner, default-storageclass
🏄  Done! kubectl is now configured to use "calico-v6" cluster and "default" namespace by default

kartikjoshi@kartikjoshiwindows:~/minikube-ipv6-support/minikube$ kubectl run v6test --image=quay.io/cilium/alpine-curl --restart=Never --command -- sleep 3600
kubectl wait pod v6test --for=condition=Ready --timeout=120s
pod/v6test created
pod/v6test condition met
kartikjoshi@kartikjoshiwindows:~/minikube-ipv6-support/minikube$ kubectl exec v6test -- ip -6 addr show dev eth0
kubectl exec v6test -- ip -6 route
3: eth0@if8: <BROADCAST,MULTICAST,UP,LOWER_UP,M-DOWN> mtu 1500 state UP qlen 1000
    inet6 fd11:33::818:5772:a663:ea01/128 scope global
       valid_lft forever preferred_lft forever
    inet6 fe80::2cf1:a1ff:fe15:2d0f/64 scope link
       valid_lft forever preferred_lft forever
fd11:33::818:5772:a663:ea01 dev eth0  metric 256
fe80::/64 dev eth0  metric 256
default via fe80::ecee:eeff:feee:eeee dev eth0  metric 1024
multicast ff00::/8 dev eth0  metric 256
kartikjoshi@kartikjoshiwindows:~/minikube-ipv6-support/minikube$ kubectl exec v6test -- curl -k -s -o /dev/null -w "%{http_code}\n" https://[fd00:210::1]:443/version
200
kartikjoshi@kartikjoshiwindows:~/minikube-ipv6-support/minikube$ kubectl create deploy v6echo --image=nginx:stable
kubectl rollout status deploy/v6echo

kubectl expose deploy v6echo --port=80 --target-port=80
kubectl get svc v6echo -o yaml | sed -n '1,80p'
deployment.apps/v6echo created
Waiting for deployment "v6echo" rollout to finish: 0 of 1 updated replicas are available...
deployment "v6echo" successfully rolled out
service/v6echo exposed
apiVersion: v1
kind: Service
metadata:
  creationTimestamp: "2025-12-06T18:51:48Z"
  labels:
    app: v6echo
  name: v6echo
  namespace: default
  resourceVersion: "2515"
  uid: e166482a-5dde-4330-967d-4f8718ce465c
spec:
  clusterIP: fd00:210::b:dc96
  clusterIPs:
  - fd00:210::b:dc96
  internalTrafficPolicy: Cluster
  ipFamilies:
  - IPv6
  ipFamilyPolicy: SingleStack
  ports:
  - port: 80
    protocol: TCP
    targetPort: 80
  selector:
    app: v6echo
  sessionAffinity: None
  type: ClusterIP
status:
  loadBalancer: {}
kartikjoshi@kartikjoshiwindows:~/minikube-ipv6-support/minikube$ # Hit the service via IPv6 cluster IP
V6IP=$(kubectl get svc v6echo -o jsonpath='{.spec.clusterIP}')
kubectl exec v6test -- curl -s -g http://[$V6IP] | head

# (Optional) DNS:
kubectl exec v6test -- nslookup v6echo.default.svc.cluster.local kube-dns.kube-system.svc.cluster.local || true
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
html { color-scheme: light dark; }
body { width: 35em; margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif; }
</style>
</head>
Server:         kube-dns.kube-system.svc.cluster.local
Address:        fd00:210::a#53

Name:   v6echo.default.svc.cluster.local
Address: fd00:210::b:dc96


kartikjoshi@kartikjoshiwindows:~/minikube-ipv6-support/minikube$ kubectl get ippools.crd.projectcalico.org -A
kubectl get ippools.crd.projectcalico.org -o yaml | sed -n '1,160p'
NAME                  AGE
default-ipv4-ippool   52m
default-ipv6-ippool   52m
apiVersion: v1
items:
- apiVersion: crd.projectcalico.org/v1
  kind: IPPool
  metadata:
    annotations:
      projectcalico.org/metadata: '{"creationTimestamp":"2025-12-06T17:42:13Z"}'
    creationTimestamp: "2025-12-06T17:42:13Z"
    generation: 1
    name: default-ipv4-ippool
    resourceVersion: "583"
    uid: 312bf383-c23e-43aa-9c53-0db3224f77c7
  spec:
    allowedUses:
    - Workload
    - Tunnel
    assignmentMode: Automatic
    blockSize: 26
    cidr: 192.168.0.0/16
    ipipMode: Never
    natOutgoing: true
    nodeSelector: all()
    vxlanMode: Never
- apiVersion: crd.projectcalico.org/v1
  kind: IPPool
  metadata:
    annotations:
      projectcalico.org/metadata: '{"creationTimestamp":"2025-12-06T17:42:13Z"}'
    creationTimestamp: "2025-12-06T17:42:13Z"
    generation: 1
    name: default-ipv6-ippool
    resourceVersion: "584"
    uid: 636dadfe-0046-417b-bb3d-0bcd8dd5ba17
  spec:
    allowedUses:
    - Workload
    - Tunnel
    assignmentMode: Automatic
    blockSize: 122
    cidr: fd11:33::/64
    ipipMode: Never
    nodeSelector: all()
    vxlanMode: Never
kind: List
metadata:
  resourceVersion: ""

kartikjoshi@kartikjoshiwindows:~/minikube-ipv6-support/minikube$ ./out/minikube start -p calico-dual   --driver=docker   --ip-family=dual
   --cni=calico   --service-cluster-ip-range=10.96.0.0/12   --service-cluster-ip-range-v6=fd00:220::/108   --pod-cidr=10.244.0.0/16   --p
od-cidr-v6=fd11:44::/64  --container-runtime=containerd
😄  [calico-dual] minikube v1.37.0 on Ubuntu 24.04 (kvm/amd64)
✨  Using the docker driver based on user configuration
📌  Using Docker driver with root privileges
💡  If Docker daemon IPv6 is disabled, enable it in /etc/docker/daemon.json and restart:
  {"ipv6": true, "fixed-cidr-v6": "fd00:55:66::/64"}
👍  Starting "calico-dual" primary control-plane node in "calico-dual" cluster
🚜  Pulling base image v0.0.48-1763789673-21948 ...
💾  Downloading Kubernetes v1.34.1 preload ...
    > preloaded-images-k8s-v18-v1...:  390.07 MiB / 390.07 MiB  100.00% 3.58 Mi
🔥  Creating docker container (CPUs=2, Memory=3072MB) ...
📦  Preparing Kubernetes v1.34.1 on containerd 2.1.5 ...
🔗  Configuring Calico (Container Networking Interface) ...
🔎  Verifying Kubernetes components...
    ▪ Using image gcr.io/k8s-minikube/storage-provisioner:v5
🌟  Enabled addons: storage-provisioner, default-storageclass
🏄  Done! kubectl is now configured to use "calico-dual" cluster and "default" namespace by default
kartikjoshi@kartikjoshiwindows:~/minikube-ipv6-support/minikube$ kubectl get pods -A
NAMESPACE     NAME                                      READY   STATUS     RESTARTS   AGE
kube-system   calico-kube-controllers-68f8b9d99-crtxl   0/1     Pending    0          67s
kube-system   calico-node-722gw                         0/1     Init:1/4   0          67s
kube-system   coredns-66bc5c9577-6xl7c                  0/1     Pending    0          67s
kube-system   etcd-calico-dual                          1/1     Running    0          72s
kube-system   kube-apiserver-calico-dual                1/1     Running    0          75s
kube-system   kube-controller-manager-calico-dual       1/1     Running    0          72s
kube-system   kube-proxy-79gb8                          1/1     Running    0          67s
kube-system   kube-scheduler-calico-dual                1/1     Running    0          75s
kube-system   storage-provisioner                       0/1     Pending    0          64s
kartikjoshi@kartikjoshiwindows:~/minikube-ipv6-support/minikube$ kubectl get pods -A
NAMESPACE     NAME                                      READY   STATUS     RESTARTS   AGE
kube-system   calico-kube-controllers-68f8b9d99-crtxl   0/1     Pending    0          69s
kube-system   calico-node-722gw                         0/1     Init:1/4   0          69s
kube-system   coredns-66bc5c9577-6xl7c                  0/1     Pending    0          69s
kube-system   etcd-calico-dual                          1/1     Running    0          74s
kube-system   kube-apiserver-calico-dual                1/1     Running    0          77s
kube-system   kube-controller-manager-calico-dual       1/1     Running    0          74s
kube-system   kube-proxy-79gb8                          1/1     Running    0          69s
kube-system   kube-scheduler-calico-dual                1/1     Running    0          77s
kube-system   storage-provisioner                       0/1     Pending    0          66s
kartikjoshi@kartikjoshiwindows:~/minikube-ipv6-support/minikube$ kubectl get pods -A
NAMESPACE     NAME                                      READY   STATUS              RESTARTS   AGE
kube-system   calico-kube-controllers-68f8b9d99-crtxl   0/1     ContainerCreating   0          113s
kube-system   calico-node-722gw                         1/1     Running             0          113s
kube-system   coredns-66bc5c9577-6xl7c                  1/1     Running             0          113s
kube-system   etcd-calico-dual                          1/1     Running             0          118s
kube-system   kube-apiserver-calico-dual                1/1     Running             0          2m1s
kube-system   kube-controller-manager-calico-dual       1/1     Running             0          118s
kube-system   kube-proxy-79gb8                          1/1     Running             0          113s
kube-system   kube-scheduler-calico-dual                1/1     Running             0          2m1s
kube-system   storage-provisioner                       1/1     Running             0          110s
kartikjoshi@kartikjoshiwindows:~/minikube-ipv6-support/minikube$ kubectl get pods -A
NAMESPACE     NAME                                      READY   STATUS              RESTARTS   AGE
kube-system   calico-kube-controllers-68f8b9d99-crtxl   0/1     ContainerCreating   0          115s
kube-system   calico-node-722gw                         1/1     Running             0          115s
kube-system   coredns-66bc5c9577-6xl7c                  1/1     Running             0          115s
kube-system   etcd-calico-dual                          1/1     Running             0          2m
kube-system   kube-apiserver-calico-dual                1/1     Running             0          2m3s
kube-system   kube-controller-manager-calico-dual       1/1     Running             0          2m
kube-system   kube-proxy-79gb8                          1/1     Running             0          115s
kube-system   kube-scheduler-calico-dual                1/1     Running             0          2m3s
kube-system   storage-provisioner                       1/1     Running             0          112s
kartikjoshi@kartikjoshiwindows:~/minikube-ipv6-support/minikube$ kubectl get pods -A
NAMESPACE     NAME                                      READY   STATUS              RESTARTS   AGE
kube-system   calico-kube-controllers-68f8b9d99-crtxl   0/1     ContainerCreating   0          2m10s
kube-system   calico-node-722gw                         1/1     Running             0          2m10s
kube-system   coredns-66bc5c9577-6xl7c                  1/1     Running             0          2m10s
kube-system   etcd-calico-dual                          1/1     Running             0          2m15s
kube-system   kube-apiserver-calico-dual                1/1     Running             0          2m18s
kube-system   kube-controller-manager-calico-dual       1/1     Running             0          2m15s
kube-system   kube-proxy-79gb8                          1/1     Running             0          2m10s
kube-system   kube-scheduler-calico-dual                1/1     Running             0          2m18s
kube-system   storage-provisioner                       1/1     Running             0          2m7s
kartikjoshi@kartikjoshiwindows:~/minikube-ipv6-support/minikube$ kubectl get pods -A
NAMESPACE     NAME                                      READY   STATUS              RESTARTS   AGE
kube-system   calico-kube-controllers-68f8b9d99-crtxl   0/1     ContainerCreating   0          2m12s
kube-system   calico-node-722gw                         1/1     Running             0          2m12s
kube-system   coredns-66bc5c9577-6xl7c                  1/1     Running             0          2m12s
kube-system   etcd-calico-dual                          1/1     Running             0          2m17s
kube-system   kube-apiserver-calico-dual                1/1     Running             0          2m20s
kube-system   kube-controller-manager-calico-dual       1/1     Running             0          2m17s
kube-system   kube-proxy-79gb8                          1/1     Running             0          2m12s
kube-system   kube-scheduler-calico-dual                1/1     Running             0          2m20s
kube-system   storage-provisioner                       1/1     Running             0          2m9s
kartikjoshi@kartikjoshiwindows:~/minikube-ipv6-support/minikube$ kubectl get pods -A
NAMESPACE     NAME                                      READY   STATUS    RESTARTS   AGE
kube-system   calico-kube-controllers-68f8b9d99-crtxl   1/1     Running   0          2m25s
kube-system   calico-node-722gw                         1/1     Running   0          2m25s
kube-system   coredns-66bc5c9577-6xl7c                  1/1     Running   0          2m25s
kube-system   etcd-calico-dual                          1/1     Running   0          2m30s
kube-system   kube-apiserver-calico-dual                1/1     Running   0          2m33s
kube-system   kube-controller-manager-calico-dual       1/1     Running   0          2m30s
kube-system   kube-proxy-79gb8                          1/1     Running   0          2m25s
kube-system   kube-scheduler-calico-dual                1/1     Running   0          2m33s
kube-system   storage-provisioner                       1/1     Running   0          2m22s
kartikjoshi@kartikjoshiwindows:~/minikube-ipv6-support/minikube$ # Node + runtime
kubectl get nodes -o wide

# Pod CIDRs on the node
kubectl get node calico-dual -o jsonpath='{.spec.podCIDRs}{"\n"}'

# Calico + core Kubernetes pods
kubectl get pods -A
NAME          STATUS   ROLES           AGE     VERSION   INTERNAL-IP   EXTERNAL-IP   OS-IMAGE                         KERNEL-VERSION                     CONTAINER-RUNTIME
calico-dual   Ready    control-plane   2m37s   v1.34.1   172.21.0.2    <none>        Debian GNU/Linux 12 (bookworm)   6.6.87.2-microsoft-standard-WSL2   containerd://2.1.5
["10.244.0.0/24","fd11:44::/64"]
NAMESPACE     NAME                                      READY   STATUS    RESTARTS   AGE
kube-system   calico-kube-controllers-68f8b9d99-crtxl   1/1     Running   0          2m28s
kube-system   calico-node-722gw                         1/1     Running   0          2m28s
kube-system   coredns-66bc5c9577-6xl7c                  1/1     Running   0          2m28s
kube-system   etcd-calico-dual                          1/1     Running   0          2m33s
kube-system   kube-apiserver-calico-dual                1/1     Running   0          2m36s
kube-system   kube-controller-manager-calico-dual       1/1     Running   0          2m33s
kube-system   kube-proxy-79gb8                          1/1     Running   0          2m28s
kube-system   kube-scheduler-calico-dual                1/1     Running   0          2m36s
kube-system   storage-provisioner                       1/1     Running   0          2m25s

kartikjoshi@kartikjoshiwindows:~/minikube-ipv6-support/minikube$ kubectl wait pod dualtest --for=condition=Ready --timeout=120s
kubectl get pod dualtest -o wide

# PodIPs reported by Kubernetes
kubectl get pod dualtest -o jsonpath='{.status.podIPs[*].ip}{"\n"}'

# Inside pod: v4/v6 addresses + routes
kubectl exec dualtest -- ip -4 addr show dev eth0
kubectl exec dualtest -- ip -6 addr show dev eth0
kubectl exec dualtest -- ip -4 route
kubectl exec dualtest -- ip -6 route
pod/dualtest condition met
NAME       READY   STATUS    RESTARTS   AGE   IP             NODE          NOMINATED NODE   READINESS GATES
dualtest   1/1     Running   0          35s   10.244.109.2   calico-dual   <none>           <none>
10.244.109.2 fd11:44::4116:a95c:cd84:6d02
3: eth0@if9: <BROADCAST,MULTICAST,UP,LOWER_UP,M-DOWN> mtu 1500 qdisc noqueue state UP qlen 1000
    inet 10.244.109.2/32 scope global eth0
       valid_lft forever preferred_lft forever
3: eth0@if9: <BROADCAST,MULTICAST,UP,LOWER_UP,M-DOWN> mtu 1500 state UP qlen 1000
    inet6 fd11:44::4116:a95c:cd84:6d02/128 scope global
       valid_lft forever preferred_lft forever
    inet6 fe80::7474:25ff:fe76:d6c0/64 scope link
       valid_lft forever preferred_lft forever
default via 169.254.1.1 dev eth0
169.254.1.1 dev eth0 scope link
fd11:44::4116:a95c:cd84:6d02 dev eth0  metric 256
fe80::/64 dev eth0  metric 256
default via fe80::ecee:eeff:feee:eeee dev eth0  metric 1024
multicast ff00::/8 dev eth0  metric 256

kartikjoshi@kartikjoshiwindows:~/minikube-ipv6-support/minikube$ kubectl get svc kubernetes -o wide
kubectl get svc kubernetes -o yaml | sed -n '1,80p'
NAME         TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)   AGE     SELECTOR
kubernetes   ClusterIP   10.96.0.1    <none>        443/TCP   4m20s   <none>
apiVersion: v1
kind: Service
metadata:
  creationTimestamp: "2025-12-08T07:39:57Z"
  labels:
    component: apiserver
    provider: kubernetes
  name: kubernetes
  namespace: default
  resourceVersion: "239"
  uid: fbdce024-c759-443c-83c5-6e34231da642
spec:
  clusterIP: 10.96.0.1
  clusterIPs:
  - 10.96.0.1
  internalTrafficPolicy: Cluster
  ipFamilies:
  - IPv4
  ipFamilyPolicy: SingleStack
  ports:
  - name: https
    port: 443
    protocol: TCP
    targetPort: 8443
  sessionAffinity: None
  type: ClusterIP
status:
  loadBalancer: {}
kartikjoshi@kartikjoshiwindows:~/minikube-ipv6-support/minikube$ APISVC=$(kubectl get svc kubernetes -o jsonpath='{.spec.clusterIP}')

kubectl exec dualtest -- \
  curl -k -s -o /dev/null -w "apiv4:%{http_code}\n" https://$APISVC:443/version
apiv4:200
kartikjoshi@kartikjoshiwindows:~/minikube-ipv6-support/minikube$ kubectl get svc kube-dns -n kube-system -o yaml | sed -n '1,80p'
apiVersion: v1
kind: Service
metadata:
  annotations:
    prometheus.io/port: "9153"
    prometheus.io/scrape: "true"
  creationTimestamp: "2025-12-08T07:39:58Z"
  labels:
    k8s-app: kube-dns
    kubernetes.io/cluster-service: "true"
    kubernetes.io/name: CoreDNS
  name: kube-dns
  namespace: kube-system
  resourceVersion: "512"
  uid: fce0962e-e159-4fd5-a99d-f234d269543a
spec:
  clusterIP: 10.96.0.10
  clusterIPs:
  - 10.96.0.10
  - fd00:220::c:68e6
  internalTrafficPolicy: Cluster
  ipFamilies:
  - IPv4
  - IPv6
  ipFamilyPolicy: PreferDualStack
  ports:
  - name: dns
    port: 53
    protocol: UDP
    targetPort: 53
  - name: dns-tcp
    port: 53
    protocol: TCP
    targetPort: 53
  - name: metrics
    port: 9153
    protocol: TCP
    targetPort: 9153
  selector:
    k8s-app: kube-dns
  sessionAffinity: None
  type: ClusterIP
status:
  loadBalancer: {}
kartikjoshi@kartikjoshiwindows:~/minikube-ipv6-support/minikube$ DNSV4=$(kubectl get svc kube-dns -n kube-system -o jsonpath='{.spec.clusterIPs[0]}')
DNSV6=$(kubectl get svc kube-dns -n kube-system -o jsonpath='{.spec.clusterIPs[1]}')

echo "kube-dns Service IPs: V4=$DNSV4 V6=$DNSV6"
kube-dns Service IPs: V4=10.96.0.10 V6=fd00:220::c:68e6
kartikjoshi@kartikjoshiwindows:~/minikube-ipv6-support/minikube$ kubectl exec dualtest -- \
  nslookup kubernetes.default.svc.cluster.local kube-dns.kube-system.svc.cluster.local
Server:         kube-dns.kube-system.svc.cluster.local
Address:        10.96.0.10#53

Name:   kubernetes.default.svc.cluster.local
Address: 10.96.0.1

kartikjoshi@kartikjoshiwindows:~/minikube-ipv6-support/minikube$ kubectl delete deploy dual-echo --ignore-not-found
kubectl delete svc dual-echo-dual --ignore-not-found

kubectl create deploy dual-echo --image=nginx:stable
kubectl rollout status deploy/dual-echo

kubectl get pods -l app=dual-echo -o wide
deployment.apps/dual-echo created
Waiting for deployment "dual-echo" rollout to finish: 0 of 1 updated replicas are available...
deployment "dual-echo" successfully rolled out
NAME                         READY   STATUS    RESTARTS   AGE   IP             NODE          NOMINATED NODE   READINESS GATES
dual-echo-76c67c76cf-5qwkn   1/1     Running   0          48s   10.244.109.3   calico-dual   <none>           <none>
kartikjoshi@kartikjoshiwindows:~/minikube-ipv6-support/minikube$ POD=$(kubectl get pod -l app=dual-echo -o jsonpath='{.items[0].metadata.name}')
kubectl get pod "$POD" -o jsonpath='{.status.podIPs[*].ip}{"\n"}'
10.244.109.3 fd11:44::4116:a95c:cd84:6d03
kartikjoshi@kartikjoshiwindows:~/minikube-ipv6-support/minikube$ cat <<'EOF' | kubectl apply -f -
apiVersion: v1
kind: Service
metadata:
  name: dual-echo-dual
  labels:
    app: dual-echo-dual
spec:
  selector:
    app: dual-echo
  type: ClusterIP
  ipFamilyPolicy: PreferDualStack
  ipFamilies:
    - IPv4
    - IPv6
  ports:
    - name: http
      port: 80
      targetPort: 80
      protocol: TCP
EOF
service/dual-echo-dual created
kartikjoshi@kartikjoshiwindows:~/minikube-ipv6-support/minikube$ kubectl get svc dual-echo-dual -o yaml | sed -n '1,80p'

kubectl get endpointslices.discovery.k8s.io \
  -l kubernetes.io/service-name=dual-echo-dual \
  -o yaml | sed -n '1,200p'
apiVersion: v1
kind: Service
metadata:
  annotations:
    kubectl.kubernetes.io/last-applied-configuration: |
      {"apiVersion":"v1","kind":"Service","metadata":{"annotations":{},"labels":{"app":"dual-echo-dual"},"name":"dual-echo-dual","namespace":"default"},"spec":{"ipFamilies":["IPv4","IPv6"],"ipFamilyPolicy":"PreferDualStack","ports":[{"name":"http","port":80,"protocol":"TCP","targetPort":80}],"selector":{"app":"dual-echo"},"type":"ClusterIP"}}
  creationTimestamp: "2025-12-08T07:48:14Z"
  labels:
    app: dual-echo-dual
  name: dual-echo-dual
  namespace: default
  resourceVersion: "979"
  uid: 65ab9493-1b6f-4588-8007-31490411f694
spec:
  clusterIP: 10.110.83.39
  clusterIPs:
  - 10.110.83.39
  - fd00:220::3:9f8d
  internalTrafficPolicy: Cluster
  ipFamilies:
  - IPv4
  - IPv6
  ipFamilyPolicy: PreferDualStack
  ports:
  - name: http
    port: 80
    protocol: TCP
    targetPort: 80
  selector:
    app: dual-echo
  sessionAffinity: None
  type: ClusterIP
status:
  loadBalancer: {}
apiVersion: v1
items:
- addressType: IPv4
  apiVersion: discovery.k8s.io/v1
  endpoints:
  - addresses:
    - 10.244.109.3
    conditions:
      ready: true
      serving: true
      terminating: false
    nodeName: calico-dual
    targetRef:
      kind: Pod
      name: dual-echo-76c67c76cf-5qwkn
      namespace: default
      uid: b0b3bf7f-c0c2-4a61-b0cd-cb2925b351d0
  kind: EndpointSlice
  metadata:
    annotations:
      endpoints.kubernetes.io/last-change-trigger-time: "2025-12-08T07:48:14Z"
    creationTimestamp: "2025-12-08T07:48:14Z"
    generateName: dual-echo-dual-
    generation: 1
    labels:
      app: dual-echo-dual
      endpointslice.kubernetes.io/managed-by: endpointslice-controller.k8s.io
      kubernetes.io/service-name: dual-echo-dual
    name: dual-echo-dual-97nbr
    namespace: default
    ownerReferences:
    - apiVersion: v1
      blockOwnerDeletion: true
      controller: true
      kind: Service
      name: dual-echo-dual
      uid: 65ab9493-1b6f-4588-8007-31490411f694
    resourceVersion: "981"
    uid: af1ad32d-08ba-41ee-82aa-3d2bbbfd4a94
  ports:
  - name: http
    port: 80
    protocol: TCP
- addressType: IPv6
  apiVersion: discovery.k8s.io/v1
  endpoints:
  - addresses:
    - fd11:44::4116:a95c:cd84:6d03
    conditions:
      ready: true
      serving: true
      terminating: false
    nodeName: calico-dual
    targetRef:
      kind: Pod
      name: dual-echo-76c67c76cf-5qwkn
      namespace: default
      uid: b0b3bf7f-c0c2-4a61-b0cd-cb2925b351d0
  kind: EndpointSlice
  metadata:
    annotations:
      endpoints.kubernetes.io/last-change-trigger-time: "2025-12-08T07:48:14Z"
    creationTimestamp: "2025-12-08T07:48:14Z"
    generateName: dual-echo-dual-
    generation: 1
    labels:
      app: dual-echo-dual
      endpointslice.kubernetes.io/managed-by: endpointslice-controller.k8s.io
      kubernetes.io/service-name: dual-echo-dual
    name: dual-echo-dual-tqbth
    namespace: default
    ownerReferences:
    - apiVersion: v1
      blockOwnerDeletion: true
      controller: true
      kind: Service
      name: dual-echo-dual
      uid: 65ab9493-1b6f-4588-8007-31490411f694
    resourceVersion: "982"
    uid: eed6f99c-8925-409f-b84e-f2944b530099
  ports:
  - name: http
    port: 80
    protocol: TCP
kind: List
metadata:
  resourceVersion: ""
kartikjoshi@kartikjoshiwindows:~/minikube-ipv6-support/minikube$
kartikjoshi@kartikjoshiwindows:~/minikube-ipv6-support/minikube$ V4=$(kubectl get svc dual-echo-dual -o jsonpath='{.spec.clusterIPs[0]}')
V6=$(kubectl get svc dual-echo-dual -o jsonpath='{.spec.clusterIPs[1]}')
echo "dual-echo-dual Service IPs: V4=$V4 V6=$V6"
dual-echo-dual Service IPs: V4=10.110.83.39 V6=fd00:220::3:9f8d
kartikjoshi@kartikjoshiwindows:~/minikube-ipv6-support/minikube$ # IPv4 VIP
kubectl exec dualtest -- \
  curl -s -g -o /dev/null -w "v4:%{http_code}\n" http://$V4:80/

# IPv6 VIP
kubectl exec dualtest -- \
  curl -s -g -o /dev/null -w "v6:%{http_code}\n" http://[$V6]:80/

# DNS-based (prefer v4/v6 depending on kube-proxy / DNS behaviour)
kubectl exec dualtest -- \
  curl -s -g -o /dev/null -w "dns:%{http_code}\n" http://dual-echo-dual.default.svc.cluster.local/
v4:200
v6:200
dns:200

minikube-bot · 2025-12-08T08:15:04Z

Can one of the admins verify this patch?

medyagh

can you plz add a Before/After this PR or maybe run an example in the description

kartikjoshi21 added 4 commits November 26, 2025 10:28

minikube: add ip-family flags and core IPv6 config plumbing

40967e8

kic: plumb ip-family and ipv6 for docker bridge

1939182

bootstrapper: plumb ip-family through kubeadm, kubelet and control-pl…

a1f0157

…ane alias

cni: add ipv6/dual-stack support for bridge, calico cni

d75647e

k8s-ci-robot requested a review from nirs December 8, 2025 08:14

k8s-ci-robot requested a review from prezha December 8, 2025 08:14

k8s-ci-robot added cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. needs-ok-to-test Indicates a PR that requires an org member to verify it is safe to test. size/XXL Denotes a PR that changes 1000+ lines, ignoring generated files. labels Dec 8, 2025

kartikjoshi21 mentioned this pull request Dec 8, 2025

minikube: Add ipv6 and dual stack support for docker/Podman #21630

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cni: add ipv6/dual-stack support for calico cni #22065

cni: add ipv6/dual-stack support for calico cni #22065

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cni: add ipv6/dual-stack support for calico cni #22065

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