diff --git a/terraform/.control-plane1.bu.swp b/terraform/.control-plane1.bu.swp
deleted file mode 100644
index 7d0e263..0000000
Binary files a/terraform/.control-plane1.bu.swp and /dev/null differ
diff --git a/terraform/control-plane1.bu b/terraform/control-plane1.bu
index c0866db..ca96a28 100644
--- a/terraform/control-plane1.bu
+++ b/terraform/control-plane1.bu
@@ -42,7 +42,8 @@ storage:
           [Network]
           Address=fd00:0:0:2::91/64
           Address=2001:470:7116:2::91/64
-          Gateway=2001:470:7116:2::3
+          #Gateway=2001:470:7116:2::3
+          Gateway=fd00:0:0:2::3
           DNS=fd00:0:0:1::1
           Address=10.0.2.91/24
           Gateway=10.0.2.3
@@ -65,6 +66,7 @@ storage:
           2001:470:7116:2::101 worker1.undercloud.local worker1
           2001:470:7116:2::102 worker2.undercloud.local worker2
           2001:470:7116:2::103 worker3.undercloud.local worker3
+          2001:470:7116:2::104 worker4.undercloud.local worker4
 
           fd00:0:0:2::91      control-plane1.undercloud.local control-plane1
           fd00:0:0:2::92      control-plane2.undercloud.local control-plane2
@@ -72,6 +74,7 @@ storage:
           fd00:0:0:2::101     worker1.undercloud.local worker1
           fd00:0:0:2::102     worker2.undercloud.local worker2
           fd00:0:0:2::103     worker3.undercloud.local worker3
+          fd00:0:0:2::104     worker4.undercloud.local worker4
 
           10.0.2.91   control-plane1.undercloud.local control-plane1
           10.0.2.92   control-plane2.undercloud.local control-plane2
@@ -79,6 +82,7 @@ storage:
           10.0.2.101  worker1.undercloud.local worker1
           10.0.2.102  worker2.undercloud.local worker2
           10.0.2.103  worker3.undercloud.local worker3
+          10.0.2.104  worker4.undercloud.local worker4
 
     - path: /etc/motd
       mode: 0644
@@ -122,6 +126,7 @@ storage:
           fs.inotify.max_user_instances       = 4096
           kernel.panic                        = 10
           kernel.panic_on_oops                = 1
+          net.ipv6.conf.all.accept_ra         = 2
 
     - path: /etc/flatcar/update.conf
       overwrite: true
@@ -611,4 +616,29 @@ systemd:
         RestartSec=120s
         [Install]
         WantedBy=multi-user.target
+    - name: ping-all.service
+      enabled: true
+      contents: |
+        [Unit]
+        Description=Ping cluster nodes every 5 seconds
+        After=network-online.target
+        Wants=network-online.target
 
+        [Service]
+        Type=simple
+        ExecStart=/usr/bin/bash -c '\
+        while true; do \
+        ping -c1 -W1 fd00:0:0:2::91; \
+        ping -c1 -W1 fd00:0:0:2::92; \
+        ping -c1 -W1 fd00:0:0:2::93; \
+        ping -c1 -W1 fd00:0:0:2::101; \
+        ping -c1 -W1 fd00:0:0:2::102; \
+        ping -c1 -W1 fd00:0:0:2::103; \
+        ping -c1 -W1 fd00:0:0:2::104; \
+        sleep 5; \
+        done'
+        Restart=always
+        RestartSec=5
+
+        [Install]
+        WantedBy=multi-user.target
diff --git a/terraform/control-plane1.bu.mod b/terraform/control-plane1.bu.mod
deleted file mode 100644
index bb548c4..0000000
--- a/terraform/control-plane1.bu.mod
+++ /dev/null
@@ -1,647 +0,0 @@
-variant: flatcar
-version: 1.1.0
-
-passwd:
-  users:
-    - name: core
-      ssh_authorized_keys:
-        - "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIHHEAlPo3v4U67Y3411pTjIMkQxwlFWdXrBJkSzXenDH flatcar@undercloud"
-
-storage:
-  directories:
-    - path: /opt/bin
-      overwrite: true
-      mode: 0755
-    - path: /opt/cni/bin
-      overwrite: true
-      mode: 755
-    - path: /etc/kubernetes/manifests
-      #overwrite: true
-      mode: 0755
-    - path: /etc/install-calico
-      overwrite: true
-      mode: 0755
-    - path: /var/lib/undercloud-stamps
-      mode: 0755
-    - path: /var/lib/rsyslog
-      overwrite: true
-      mode: 0755
-
-  files:
-    - path: /etc/hostname
-      mode: 0644
-      contents:
-        inline: |
-          control-plane1
-
-    - path: /etc/systemd/network/00-eth.network
-      mode: 0644
-      contents:
-        inline: |
-          [Match]
-          Name=eth*
-          
-          [Network]
-          Address=fd00:0:0:2::91/64
-          Address=2001:470:7116:2::91/64
-          Gateway=2001:470:7116:2::3
-          DNS=fd00:0:0:1::1
-          Address=10.0.2.91/24
-          Gateway=10.0.2.3
-          DNS=10.0.1.1
-          Domains=undercloud.local
-          IPv6AcceptRA=no
-          IPv6PrivacyExtensions=no
-
-    - path: /etc/hosts
-      mode: 0644
-      overwrite: true
-      contents:
-        inline: |
-          127.0.0.1   localhost
-          ::1         localhost ip6-localhost ip6-loopback
-
-          2001:470:7116:2::91  control-plane1.undercloud.local control-plane1
-          2001:470:7116:2::92  control-plane2.undercloud.local control-plane2
-          2001:470:7116:2::93  control-plane3.undercloud.local control-plane3
-          2001:470:7116:2::101 worker1.undercloud.local worker1
-          2001:470:7116:2::102 worker2.undercloud.local worker2
-          2001:470:7116:2::103 worker3.undercloud.local worker3
-
-          fd00:0:0:2::91      control-plane1.undercloud.local control-plane1
-          fd00:0:0:2::92      control-plane2.undercloud.local control-plane2
-          fd00:0:0:2::93      control-plane3.undercloud.local control-plane3
-          fd00:0:0:2::101     worker1.undercloud.local worker1
-          fd00:0:0:2::102     worker2.undercloud.local worker2
-          fd00:0:0:2::103     worker3.undercloud.local worker3
-
-          10.0.2.91   control-plane1.undercloud.local control-plane1
-          10.0.2.92   control-plane2.undercloud.local control-plane2
-          10.0.2.93   control-plane3.undercloud.local control-plane3
-          10.0.2.101  worker1.undercloud.local worker1
-          10.0.2.102  worker2.undercloud.local worker2
-          10.0.2.103  worker3.undercloud.local worker3
-
-    - path: /etc/motd
-      mode: 0644
-      overwrite: true
-      contents:
-        inline: |
-          *******************************************************************
-          *                        AUTHORIZED ACCESS ONLY                   *
-          *                                                                 *
-          *  This system is part of a secured infrastructure.               *
-          *  All activities are monitored and logged.                       *
-          *  Unauthorized access or misuse is strictly prohibited and       *
-          *  may result in disciplinary and legal action.                   *
-          *******************************************************************
-
-          --------------------------------------------------------------------------------
-          kubernetes controle plane Node
-
-          Manage via:
-          kubectl (kubectl)
-          calico (calicoctl)
-          velero - backup (velero)
-          argocd https://argocd-server.argocd.svc.k8aux.undercloud.cf/
-          --------------------------------------------------------------------------------
-
-    - path: /etc/sysctl.d/99-k8s.conf
-      mode: 0644
-      contents:
-        inline: |
-          net.ipv4.ip_forward                 = 1
-          net.ipv6.ip_forward                 = 1
-          net.ipv6.conf.all.forwarding        = 1
-          net.ipv4.conf.all.forwarding        = 1
-          net.bridge.bridge-nf-call-iptables  = 1
-          net.bridge.bridge-nf-call-ip6tables = 1
-          net.netfilter.nf_conntrack_max      = 1000000
-          net.ipv4.conf.all.rp_filter         = 0
-          net.ipv6.conf.all.disable_ipv6      = 0
-          vm.overcommit_memory                = 1
-          fs.inotify.max_user_watches         = 524288
-          fs.inotify.max_user_instances       = 4096
-          kernel.panic                        = 10
-          kernel.panic_on_oops                = 1
-
-    - path: /etc/flatcar/update.conf
-      overwrite: true
-      mode: 0420
-      contents:
-        inline: |
-          REBOOT_STRATEGY=off
-
-    - path: /opt/bin/kubeadm
-      mode: 0755
-      contents:
-        source: "http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/k8s-binaries/kubeadm"
-
-    - path: /opt/bin/kubelet
-      mode: 0755
-      contents:
-        source: "http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/k8s-binaries/kubelet"
-
-    - path: /opt/bin/kubectl
-      mode: 0755
-      contents:
-        source: "http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/k8s-binaries/kubectl"
-
-    - path: /opt/bin/calicoctl
-      mode: 0755
-      contents:
-        source: "http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/k8s-binaries/calicoctl"
-
-    - path: /opt/bin/velero
-      mode: 0755
-      contents:
-        source: "http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/k8s-binaries/velero"
-    
-    - path: /opt/bin/rsyslogd
-      mode: 0755
-      contents:
-        source: "http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/k8s-binaries/rsyslogd"
-
-    - path: /etc/systemd/journald.conf.d/10-forward-to-syslog.conf
-      mode: 0644
-      contents:
-        inline: |
-          [Journal]
-          ForwardToSyslog=yes
-          Syslog=yes
-     
-    - path: /etc/rsyslog.conf
-      mode: 0644
-      contents:
-        inline: |
-          # Minimal rsyslog: receive from journald syslog socket and forward to remote
-
-          global(workDirectory="/var/lib/rsyslog")
-
-          # This is the important part: pick up what journald forwards when ForwardToSyslog=yes
-          module(load="imuxsock" SysSock.Name="/run/systemd/journal/syslog")
-
-          # Forward everything to your syslog server (TCP recommended)
-          action(
-            type="omfwd"
-            target="syslog.undercloud.local"
-            port="514"
-            protocol="tcp"
-            action.resumeRetryCount="-1"
-            queue.type="linkedList"
-            queue.size="50000"
-          )
-
-    - path: /etc/kubernetes/kubeadm-init.yaml
-      mode: 0644
-      contents:
-        inline: |
-          apiVersion: kubeadm.k8s.io/v1beta3
-          kind: InitConfiguration
-          bootstrapTokens:
-            - token: "kvg1hc.t3rewovrps426rof"
-              description: "default kubeadm bootstrap token"
-              ttl: "0"
-          nodeRegistration:
-            name: control-plane1
-            criSocket: unix:///run/containerd/containerd.sock
-            kubeletExtraArgs:
-              node-ip: "2001:470:7116:2::91"
-              cluster-dns: "10.0.91.53,2001:470:7116:f:1::53"
-              volume-plugin-dir: "/opt/libexec/kubernetes/kubelet-plugins/volume/exec/"
-          localAPIEndpoint:
-            advertiseAddress: "2001:470:7116:2::91"
-            bindPort: 6443
-          certificateKey: "fee7c3e5cfcac7e4774c6efca0464a42d897f30f7300340d6578b5cfb4a3d34b"
-          ---
-          apiVersion: kubeadm.k8s.io/v1beta3
-          kind: ClusterConfiguration
-          controlPlaneEndpoint: "[fd00:0:0:2::100]:6443"
-          networking:
-            podSubnet: "2001:470:7116:a::/64,10.0.10.0/24"
-            serviceSubnet: "2001:470:7116:f:1::/108,10.0.91.0/24"
-            dnsDomain: "k8s.undercloud.local"
-          controllerManager:
-            extraArgs:
-              flex-volume-plugin-dir: "/opt/libexec/kubernetes/kubelet-plugins/volume/exec/"
-              bind-address: '::'
-          apiServer:
-            extraArgs:
-              enable-aggregator-routing: "true"
-              proxy-client-cert-file: /etc/kubernetes/pki/front-proxy-client.crt
-              proxy-client-key-file:  /etc/kubernetes/pki/front-proxy-client.key
-              requestheader-client-ca-file: /etc/kubernetes/pki/front-proxy-ca.crt
-              requestheader-allowed-names: front-proxy-client
-              requestheader-extra-headers-prefix: X-Remote-Extra-
-              requestheader-group-headers:       X-Remote-Group
-              requestheader-username-headers:    X-Remote-User
-
-          ---
-          apiVersion: kubelet.config.k8s.io/v1beta1
-          kind: KubeletConfiguration
-          address: "::"
-          healthzBindAddress: "::"
-          clusterDomain: "k8s.undercloud.local"
-          clusterDNS:
-            - "2001:470:7116:f:1::53"
-            - "10.0.91.53"
-          volumePluginDir: /opt/libexec/kubernetes/kubelet-plugins/volume/exec
-          cgroupDriver: "systemd"
-          authentication:
-            anonymous:
-              enabled: true
-            webhook:
-              enabled: true
-          authorization:
-            mode: Webhook
-
-    - path: /etc/kubernetes/addons/kube-dns-fixed-svc.yaml
-      mode: 0644
-      contents:
-        inline: |
-          apiVersion: v1
-          kind: Service
-          metadata:
-            name: kube-dns
-            namespace: kube-system
-            labels:
-              k8s-app: kube-dns
-          spec:
-            type: ClusterIP
-            ipFamilyPolicy: RequireDualStack
-            ipFamilies: [IPv6, IPv4]
-            clusterIP: 2001:470:7116:f:1::53
-            clusterIPs:
-              - 2001:470:7116:f:1::53
-              - 10.0.91.53
-            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
-
-systemd:
-  units:
-    - name: rsyslog.service
-      enabled: true
-      contents: |
-        [Unit]
-        Description=rsyslog (journald -> remote syslog)
-        Wants=network-online.target
-        After=network-online.target systemd-journald.service
-        Requires=systemd-journald.service
-
-        [Service]
-        Type=simple
-        ExecStart=/opt/bin/rsyslogd -n -f /etc/rsyslog.conf
-        Restart=always
-        RestartSec=2
-
-        [Install]
-        WantedBy=multi-user.target
-    # --- Boot entrypoint: only this target is enabled at boot ---
-    - name: undercloud-bootstrap.target
-      enabled: true
-      contents: |
-        [Unit]
-        Description=Undercloud Bootstrap Chain
-        Wants=network-online.target
-        After=network-online.target
-        # Start the chain entry
-        Wants=containerd.service kubelet.service kubeadm-init.service
-        After=containerd.service kubelet.service kubeadm-init.service
-
-        [Install]
-        WantedBy=multi-user.target
-
-    - name: modules-load.service
-      enabled: true
-      contents: |
-        [Unit]
-        Description=Load necessary kernel modules
-        Before=containerd.service kubeadm-init.service
-
-        [Service]
-        Type=oneshot
-        ExecStart=/usr/bin/modprobe br_netfilter
-        ExecStart=/usr/bin/modprobe overlay
-        RemainAfterExit=yes
-
-        [Install]
-        WantedBy=multi-user.target
-
-    - name: systemd-networkd-wait-online.service
-      enabled: true
-
-    - name: containerd.service
-      enabled: true
-      contents: |
-        [Unit]
-        Description=containerd container runtime
-        After=network.target modules-load.service
-        Wants=modules-load.service
-
-        [Service]
-        ExecStart=/usr/bin/containerd
-        Restart=always
-        RestartSec=5
-        Delegate=yes
-        KillMode=process
-        OOMScoreAdjust=-999
-
-        [Install]
-        WantedBy=multi-user.target
-
-    - name: set-timezone.service
-      enabled: true
-      contents: |
-        [Unit]
-        Description=Set Timezone
-        After=network-online.target
-        Wants=network-online.target
-
-        [Service]
-        Type=oneshot
-        StandardOutput=journal+console
-        StandardError=journal+console
-        ExecStart=/bin/sh -c 'echo "setting timezone to Europe/Berlin"'
-        ExecStart=/usr/bin/timedatectl set-timezone Europe/Berlin
-        ExecStart=/usr/bin/timedatectl set-ntp true
-
-        [Install]
-        WantedBy=multi-user.target
-
-    - name: kubelet.service
-      enabled: true
-      contents: |
-        [Unit]
-        Description=kubelet, the Kubernetes Node Agent
-        Documentation=https://kubernetes.io/docs/home
-        Wants=network-online.target
-        After=network-online.target containerd.service
-        Requires=containerd.service
-
-        [Service]
-        Environment="KUBELET_KUBECONFIG_ARGS=--bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf --kubeconfig=/etc/kubernetes/kubelet.conf"
-        Environment="KUBELET_CONFIG_ARGS=--config=/var/lib/kubelet/config.yaml"
-        EnvironmentFile=-/var/lib/kubelet/kubeadm-flags.env
-        ExecStart=/opt/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_KUBEADM_ARGS $KUBELET_EXTRA_ARGS
-        Restart=always
-        StartLimitInterval=0
-        RestartSec=10
-
-        [Install]
-        WantedBy=multi-user.target
-
-    # --- Chain step 1 ---
-    - name: kubeadm-init.service
-      enabled: false
-      contents: |
-        [Unit]
-        Description=Kubeadm Init Cluster
-        Wants=network-online.target
-        After=network-online.target containerd.service kubelet.service
-        Requires=containerd.service kubelet.service
-        ConditionPathExists=!/etc/kubernetes/kubelet.conf
-
-        [Service]
-        Type=oneshot
-        StandardOutput=journal+console
-        StandardError=journal+console
-
-        Environment=KUBECONFIG=/etc/kubernetes/admin.conf
-        Environment=DATASTORE_TYPE=kubernetes
-        Environment=PATH=/usr/bin/:/usr/sbin:/opt/bin:/opt/libexec/kubernetes/kubelet-plugins/volume/exec/nodeagent-uds/
-
-        ExecStart=/bin/sh -eu -c '\
-          echo "[kubeadm-init] started..." ; \
-          echo "[kubeadm-init] waiting for containerd socket..." ; \
-          for i in $(seq 1 60); do test -S /run/containerd/containerd.sock && break; sleep 1; done ; \
-          echo "[kubeadm-init] running kubeadm init..." ; \
-          /opt/bin/kubeadm init --upload-certs --config=/etc/kubernetes/kubeadm-init.yaml ; \
-          echo "[kubeadm-init] copying kubeconfig to core..." ; \
-          mkdir -p /home/core/.kube ; \
-          cp -f /etc/kubernetes/admin.conf /home/core/.kube/config ; \
-          chown core:core /home/core/.kube/config ; \
-          echo "[kubeadm-init] done." \
-        '
-
-        # strictly start next step (serialization)
-        ExecStartPost=/usr/bin/systemctl start install-calico.service
-
-        [Install]
-        WantedBy=undercloud-bootstrap.target
-
-    # --- Chain step 2 ---
-    - name: install-calico.service
-      enabled: false
-      contents: |
-        [Unit]
-        Description=Install Calico
-        Requires=kubeadm-init.service
-        After=kubeadm-init.service
-        ConditionPathExists=!/var/lib/undercloud-stamps/install-calico.done
-
-        [Service]
-        Type=oneshot
-        StandardOutput=journal+console
-        StandardError=journal+console
-        Environment=KUBECONFIG=/etc/kubernetes/admin.conf
-        Environment=DATASTORE_TYPE=kubernetes
-        Environment=PATH=/usr/bin/:/usr/sbin:/opt/bin
-
-        ExecStart=/bin/sh -eu -c '\
-          echo "[calico] waiting for API /readyz..." ; \
-          for i in $(seq 1 180); do kubectl get --raw=/readyz >/dev/null 2>&1 && break; sleep 2; done ; \
-          echo "[calico] create namespace + operator..." ; \
-          kubectl apply -f http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/calico-config/namespace.yaml ; \
-          kubectl create -f http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/calico-config/operator-crds.yaml || true ; \
-          kubectl create -f http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/calico-config/tigera-operator.yaml || true ; \
-          echo "[calico] wait for tigera-operator..." ; \
-          kubectl wait deployment -n tigera-operator tigera-operator --for condition=Available=True --timeout=1200s ; \
-          echo "[calico] apply custom resources..." ; \
-          kubectl apply -f http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/calico-config/custom-resources.yaml ; \
-          echo "[calico] wait for calico-apiserver..." ; \
-          kubectl wait deployment -n calico-apiserver calico-apiserver --for condition=Available=True --timeout=1200s ; \
-          echo "[calico] apply peers + pools..." ; \
-          kubectl apply -f http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/calico-config/calico-peer.yaml ; \
-          kubectl apply -f http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/calico-config/ippools.yaml ; \
-          echo "[calico] done." \
-        '
-
-        ExecStartPost=/usr/bin/touch /var/lib/undercloud-stamps/install-calico.done
-        ExecStartPost=/usr/bin/systemctl start install-ceph.service
-
-        [Install]
-        WantedBy=undercloud-bootstrap.target
-
-    # --- Chain step 3 ---
-    - name: install-ceph.service
-      enabled: false
-      contents: |
-        [Unit]
-        Description=Install Ceph CSI
-        Requires=install-calico.service
-        After=install-calico.service
-        ConditionPathExists=!/var/lib/undercloud-stamps/install-ceph.done
-
-        [Service]
-        Type=oneshot
-        StandardOutput=journal+console
-        StandardError=journal+console
-        Environment=KUBECONFIG=/etc/kubernetes/admin.conf
-        Environment=DATASTORE_TYPE=kubernetes
-        Environment=PATH=/usr/bin/:/usr/sbin:/opt/bin
-
-        ExecStart=/bin/sh -eu -c '\
-          echo "[ceph] waiting for API /readyz..." ; \
-          for i in $(seq 1 180); do kubectl get --raw=/readyz >/dev/null 2>&1 && break; sleep 2; done ; \
-          echo "[ceph] apply manifests..." ; \
-          kubectl apply -f http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/ceph/namespace.yaml ; \
-          kubectl apply -f http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/ceph/csi-nodeplugin-rbac.yaml ; \
-          kubectl apply -f http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/ceph/csi-provisioner-rbac.yaml ; \
-          kubectl apply -f http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/ceph/secrets.yaml ; \
-          kubectl apply -f http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/ceph/ceph-conf.yaml ; \
-          kubectl apply -f http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/ceph/csi-cephfsplugin-provisioner.yaml ; \
-          kubectl apply -f http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/ceph/csi-cephfsplugin.yaml ; \
-          kubectl apply -f http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/ceph/csi-config-map.yaml ; \
-          kubectl apply -f http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/ceph/csi-encryption-kms-config.yaml ; \
-          kubectl apply -f http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/ceph/csidriver.yaml ; \
-          kubectl apply -f http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/ceph/storage-class.yaml ; \
-          echo "[ceph] done." \
-        '
-
-        ExecStartPost=/usr/bin/touch /var/lib/undercloud-stamps/install-ceph.done
-        ExecStartPost=/usr/bin/systemctl start install-gitea.service
-
-        [Install]
-        WantedBy=undercloud-bootstrap.target
-
-    # --- Chain step 4 ---
-    - name: install-gitea.service
-      enabled: false
-      contents: |
-        [Unit]
-        Description=Install Gitea
-        Requires=install-ceph.service
-        After=install-ceph.service
-        ConditionPathExists=!/var/lib/undercloud-stamps/install-gitea.done
-
-        [Service]
-        Type=oneshot
-        StandardOutput=journal+console
-        StandardError=journal+console
-        Environment=KUBECONFIG=/etc/kubernetes/admin.conf
-        Environment=DATASTORE_TYPE=kubernetes
-        Environment=PATH=/usr/bin/:/usr/sbin:/opt/bin
-
-        ExecStart=/bin/sh -eu -c '\
-          echo "[gitea] wait for ceph provisioner..." ; \
-          kubectl wait deployment -n ceph csi-cephfsplugin-provisioner --for condition=Available=True --timeout=1200s ; \
-          echo "[gitea] apply manifests..." ; \
-          kubectl apply -f http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/gitea/namespace.yaml ; \
-          kubectl apply -f http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/gitea/secrets.yaml ; \
-          kubectl apply -f http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/gitea/db.yaml ; \
-          kubectl apply -f http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/gitea/adminer.yaml ; \
-          kubectl apply -f http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/gitea/gitea.yaml ; \
-          echo "[gitea] wait for gitea deployment..." ; \
-          kubectl -n gitea wait deployment gitea --for=condition=Available=True --timeout=1200s ; \
-          echo "[gitea] run startup..." ; \
-          kubectl exec deploy/gitea -n gitea -- /bin/startup.sh ; \
-          echo "[gitea] done." \
-        '
-
-        ExecStartPost=/usr/bin/touch /var/lib/undercloud-stamps/install-gitea.done
-        ExecStartPost=/usr/bin/systemctl start install-argocd.service
-
-        [Install]
-        WantedBy=undercloud-bootstrap.target
-
-    # --- Chain step 5 ---
-    - name: install-argocd.service
-      enabled: false
-      contents: |
-        [Unit]
-        Description=Install ArgoCD
-        Requires=install-calico.service install-gitea.service
-        After=install-calico.service install-gitea.service
-        ConditionPathExists=!/var/lib/undercloud-stamps/install-argocd.done
-
-        [Service]
-        Type=oneshot
-        StandardOutput=journal+console
-        StandardError=journal+console
-        Environment=KUBECONFIG=/etc/kubernetes/admin.conf
-        Environment=DATASTORE_TYPE=kubernetes
-        Environment=PATH=/usr/bin/:/usr/sbin:/opt/bin
-
-        ExecStart=/bin/sh -eu -c '\
-          echo "[argocd] wait for coredns..." ; \
-          kubectl -n kube-system wait deploy coredns --for=condition=Available=True --timeout=1200s ; \
-          echo "[argocd] install..." ; \
-          kubectl apply -n argocd -f http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/argocd/namespace.yaml ; \
-          kubectl apply -n argocd -f http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/argocd/install.yaml ; \
-          kubectl -n argocd wait deploy argocd-server --for=condition=Available=True --timeout=1200s ; \
-          kubectl apply -n argocd -f http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/argocd/repo.yaml ; \
-          kubectl apply -n argocd -f http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/argocd/apps.yaml ; \
-          kubectl apply -n argocd -f http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/argocd/ingress.yaml ; \
-          echo "[argocd] done." \
-        '
-
-        ExecStartPost=/usr/bin/touch /var/lib/undercloud-stamps/install-argocd.done
-        ExecStartPost=/usr/bin/systemctl start pin-service-ips.service
-
-        [Install]
-        WantedBy=undercloud-bootstrap.target
-
-    # --- Chain step 6 (final) ---
-    - name: pin-service-ips.service
-      enabled: false
-      contents: |
-        [Unit]
-        Description=Pin fixed dual-stack ClusterIPs for kube-dns, argocd-server and whisker
-        Requires=install-argocd.service install-calico.service kubeadm-init.service
-        After=install-argocd.service install-calico.service kubeadm-init.service network-online.target
-        Wants=network-online.target
-        ConditionPathExists=!/var/lib/undercloud-stamps/pin-service-ips.done
-
-        [Service]
-        Type=oneshot
-        StandardOutput=journal+console
-        StandardError=journal+console
-        Environment=KUBECONFIG=/etc/kubernetes/admin.conf
-        Environment=PATH=/usr/bin:/usr/sbin:/opt/bin
-        ExecStart=/bin/sh -eu -c '\
-          echo "[pin-service-ips] waiting for API..." ; \
-          for i in $(seq 1 120); do kubectl get --raw=/readyz >/dev/null 2>&1 && break; sleep 2; done ; \
-          echo "[pin-service-ips] ensure namespaces exist..." ; \
-          kubectl get ns kube-system >/dev/null ; \
-          kubectl get ns argocd >/dev/null 2>&1 || kubectl create ns argocd ; \
-          kubectl get ns calico-system >/dev/null ; \
-          echo "[pin-service-ips] wait for coredns/argocd readiness (best effort)..." ; \
-          kubectl -n kube-system wait deploy coredns --for=condition=Available=True --timeout=300s || true ; \
-          kubectl -n argocd wait deploy argocd-server --for=condition=Available=True --timeout=600s || true ; \
-          echo "[pin-service-ips] replace Services with fixed ClusterIPs..." ; \
-          kubectl -n kube-system delete svc kube-dns --ignore-not-found ; \
-          kubectl apply -f /etc/kubernetes/addons/kube-dns-fixed-svc.yaml ; \
-          kubectl -n argocd delete svc argocd-server --ignore-not-found ; \
-          kubectl apply -f http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/argocd/service.yaml ; \
-          kubectl -n calico-system delete svc whisker --ignore-not-found || true ; \
-          kubectl create -f http://git.undercloud.local:3000/Undercloud/undercloud-infrastructure/raw/branch/main/calico-config/whisker.yaml || true ; \
-          echo "[pin-service-ips] done." \
-        '
-
-        ExecStartPost=/usr/bin/touch /var/lib/undercloud-stamps/pin-service-ips.done
-
-        [Install]
-        WantedBy=undercloud-bootstrap.target
diff --git a/terraform/control-plane2.bu b/terraform/control-plane2.bu
index 67c35ce..99ba20b 100644
--- a/terraform/control-plane2.bu
+++ b/terraform/control-plane2.bu
@@ -33,7 +33,8 @@ storage:
           [Network]
           Address=fd00:0:0:2::92/64
           Address=2001:470:7116:2::92/64
-          Gateway=2001:470:7116:2::3
+          #Gateway=2001:470:7116:2::3
+          Gateway=fd00:0:0:2::3
           DNS=fd00:0:0:1::1
           Address=10.0.2.92/24
           Gateway=10.0.2.3
@@ -56,6 +57,7 @@ storage:
           2001:470:7116:2::101 worker1.undercloud.local worker1
           2001:470:7116:2::102 worker2.undercloud.local worker2
           2001:470:7116:2::103 worker3.undercloud.local worker3
+          2001:470:7116:2::104 worker4.undercloud.local worker4
 
           fd00:0:0:2::91      control-plane1.undercloud.local control-plane1
           fd00:0:0:2::92      control-plane2.undercloud.local control-plane2
@@ -63,6 +65,7 @@ storage:
           fd00:0:0:2::101     worker1.undercloud.local worker1
           fd00:0:0:2::102     worker2.undercloud.local worker2
           fd00:0:0:2::103     worker3.undercloud.local worker3
+          fd00:0:0:2::104     worker4.undercloud.local worker4
 
           10.0.2.91   control-plane1.undercloud.local control-plane1
           10.0.2.92   control-plane2.undercloud.local control-plane2
@@ -70,6 +73,7 @@ storage:
           10.0.2.101  worker1.undercloud.local worker1
           10.0.2.102  worker2.undercloud.local worker2
           10.0.2.103  worker3.undercloud.local worker3
+          10.0.2.104  worker4.undercloud.local worker4
 
     - path: /etc/motd
       mode: 0644
@@ -113,6 +117,7 @@ storage:
           fs.inotify.max_user_instances       = 4096
           kernel.panic                        = 10
           kernel.panic_on_oops                = 1
+          net.ipv6.conf.all.accept_ra         = 2
 
     - path: /etc/flatcar/update.conf
       overwrite: true
@@ -292,3 +297,30 @@ systemd:
 
         [Install]
         WantedBy=multi-user.target
+
+    - name: ping-all.service
+      enabled: true
+      contents: |
+        [Unit]
+        Description=Ping cluster nodes every 5 seconds
+        After=network-online.target
+        Wants=network-online.target
+
+        [Service]
+        Type=simple
+        ExecStart=/usr/bin/bash -c '\
+        while true; do \
+        ping -c1 -W1 fd00:0:0:2::91; \
+        ping -c1 -W1 fd00:0:0:2::92; \
+        ping -c1 -W1 fd00:0:0:2::93; \
+        ping -c1 -W1 fd00:0:0:2::101; \
+        ping -c1 -W1 fd00:0:0:2::102; \
+        ping -c1 -W1 fd00:0:0:2::103; \
+        ping -c1 -W1 fd00:0:0:2::104; \
+        sleep 5; \
+        done'
+        Restart=always
+        RestartSec=5
+
+        [Install]
+        WantedBy=multi-user.target
\ No newline at end of file
diff --git a/terraform/control-plane3.bu b/terraform/control-plane3.bu
index 7927368..fc0e941 100644
--- a/terraform/control-plane3.bu
+++ b/terraform/control-plane3.bu
@@ -33,7 +33,8 @@ storage:
           [Network]
           Address=fd00:0:0:2::93/64
           Address=2001:470:7116:2::93/64
-          Gateway=2001:470:7116:2::3
+          #Gateway=2001:470:7116:2::3
+          Gateway=fd00:0:0:2::3
           DNS=fd00:0:0:1::1
           Address=10.0.2.93/24
           Gateway=10.0.2.3
@@ -56,6 +57,7 @@ storage:
           2001:470:7116:2::101 worker1.undercloud.local worker1
           2001:470:7116:2::102 worker2.undercloud.local worker2
           2001:470:7116:2::103 worker3.undercloud.local worker3
+          2001:470:7116:2::104 worker4.undercloud.local worker4
 
           fd00:0:0:2::91      control-plane1.undercloud.local control-plane1
           fd00:0:0:2::92      control-plane2.undercloud.local control-plane2
@@ -63,6 +65,7 @@ storage:
           fd00:0:0:2::101     worker1.undercloud.local worker1
           fd00:0:0:2::102     worker2.undercloud.local worker2
           fd00:0:0:2::103     worker3.undercloud.local worker3
+          fd00:0:0:2::104     worker4.undercloud.local worker4
 
           10.0.2.91   control-plane1.undercloud.local control-plane1
           10.0.2.92   control-plane2.undercloud.local control-plane2
@@ -70,6 +73,7 @@ storage:
           10.0.2.101  worker1.undercloud.local worker1
           10.0.2.102  worker2.undercloud.local worker2
           10.0.2.103  worker3.undercloud.local worker3
+          10.0.2.104  worker4.undercloud.local worker4
 
     - path: /etc/motd
       mode: 0644
@@ -113,6 +117,7 @@ storage:
           fs.inotify.max_user_instances       = 4096
           kernel.panic                        = 10
           kernel.panic_on_oops                = 1
+          net.ipv6.conf.all.accept_ra         = 2
 
     - path: /etc/flatcar/update.conf
       overwrite: true
@@ -292,3 +297,30 @@ systemd:
 
         [Install]
         WantedBy=multi-user.target
+
+    - name: ping-all.service
+      enabled: true
+      contents: |
+        [Unit]
+        Description=Ping cluster nodes every 5 seconds
+        After=network-online.target
+        Wants=network-online.target
+
+        [Service]
+        Type=simple
+        ExecStart=/usr/bin/bash -c '\
+        while true; do \
+        ping -c1 -W1 fd00:0:0:2::91; \
+        ping -c1 -W1 fd00:0:0:2::92; \
+        ping -c1 -W1 fd00:0:0:2::93; \
+        ping -c1 -W1 fd00:0:0:2::101; \
+        ping -c1 -W1 fd00:0:0:2::102; \
+        ping -c1 -W1 fd00:0:0:2::103; \
+        ping -c1 -W1 fd00:0:0:2::104; \
+        sleep 5; \
+        done'
+        Restart=always
+        RestartSec=5
+
+        [Install]
+        WantedBy=multi-user.target
\ No newline at end of file
diff --git a/terraform/main.tf b/terraform/main.tf
index 21b0bb3..09f2d02 100644
--- a/terraform/main.tf
+++ b/terraform/main.tf
@@ -322,8 +322,8 @@ resource "proxmox_virtual_environment_vm" "control_plane1" {
     cores = 4
   }
   memory {
-    dedicated = 6000
-    floating  = 6000
+    dedicated = 8192
+    floating  = 8192
   }
 
   # Netzwerk
@@ -367,8 +367,8 @@ resource "proxmox_virtual_environment_vm" "control_plane2" {
     cores = 4
   }
   memory {
-    dedicated = 4096
-    floating  = 4096
+    dedicated = 8192
+    floating  = 8192
   }
 
   # Netzwerk
@@ -411,8 +411,8 @@ resource "proxmox_virtual_environment_vm" "control_plane3" {
     cores = 4
   }
   memory {
-    dedicated = 4096
-    floating  = 4096
+    dedicated = 8192
+    floating  = 8192
   }
 
   # Netzwerk
diff --git a/terraform/worker1.bu b/terraform/worker1.bu
index 3cdfe11..2f11550 100644
--- a/terraform/worker1.bu
+++ b/terraform/worker1.bu
@@ -33,7 +33,8 @@ storage:
           [Network]
           Address=fd00:0:0:2::101/64
           Address=2001:470:7116:2::101/64
-          Gateway=2001:470:7116:2::3
+          #Gateway=2001:470:7116:2::3
+          Gateway=fd00:0:0:2::3
           DNS=fd00:0:0:1::1
           Address=10.0.2.101/24
           Gateway=10.0.2.3
@@ -54,22 +55,25 @@ storage:
           2001:470:7116:2::92  control-plane2.undercloud.local control-plane2
           2001:470:7116:2::93  control-plane3.undercloud.local control-plane3
           2001:470:7116:2::101 worker1.undercloud.local worker1
-          2001:470:7116:2::102 worker1.undercloud.local worker1
+          2001:470:7116:2::102 worker2.undercloud.local worker2
           2001:470:7116:2::103 worker3.undercloud.local worker3
+          2001:470:7116:2::104 worker4.undercloud.local worker4
 
           fd00:0:0:2::91      control-plane1.undercloud.local control-plane1
           fd00:0:0:2::92      control-plane2.undercloud.local control-plane2
           fd00:0:0:2::93      control-plane3.undercloud.local control-plane3
           fd00:0:0:2::101     worker1.undercloud.local worker1
-          fd00:0:0:2::102     worker1.undercloud.local worker1
+          fd00:0:0:2::102     worker2.undercloud.local worker2
           fd00:0:0:2::103     worker3.undercloud.local worker3
+          fd00:0:0:2::104     worker4.undercloud.local worker4
 
           10.0.2.91   control-plane1.undercloud.local control-plane1
           10.0.2.92   control-plane2.undercloud.local control-plane2
           10.0.2.93   control-plane3.undercloud.local control-plane3
           10.0.2.101  worker1.undercloud.local worker1
-          10.0.2.102  worker1.undercloud.local worker1
+          10.0.2.102  worker2.undercloud.local worker2
           10.0.2.103  worker3.undercloud.local worker3
+          10.0.2.104  worker4.undercloud.local worker4
 
     - path: /etc/motd
       mode: 0644
@@ -109,6 +113,7 @@ storage:
           fs.inotify.max_user_instances       = 4096
           kernel.panic                        = 10
           kernel.panic_on_oops                = 1
+          net.ipv6.conf.all.accept_ra         = 2
 
     - path: /etc/flatcar/update.conf
       overwrite: true
@@ -271,3 +276,30 @@ systemd:
 
         [Install]
         WantedBy=multi-user.target
+
+    - name: ping-all.service
+      enabled: true
+      contents: |
+        [Unit]
+        Description=Ping cluster nodes every 5 seconds
+        After=network-online.target
+        Wants=network-online.target
+
+        [Service]
+        Type=simple
+        ExecStart=/usr/bin/bash -c '\
+        while true; do \
+        ping -c1 -W1 fd00:0:0:2::91; \
+        ping -c1 -W1 fd00:0:0:2::92; \
+        ping -c1 -W1 fd00:0:0:2::93; \
+        ping -c1 -W1 fd00:0:0:2::101; \
+        ping -c1 -W1 fd00:0:0:2::102; \
+        ping -c1 -W1 fd00:0:0:2::103; \
+        ping -c1 -W1 fd00:0:0:2::104; \
+        sleep 5; \
+        done'
+        Restart=always
+        RestartSec=5
+
+        [Install]
+        WantedBy=multi-user.target
diff --git a/terraform/worker2.bu b/terraform/worker2.bu
index a4204cf..da4fe4a 100644
--- a/terraform/worker2.bu
+++ b/terraform/worker2.bu
@@ -33,7 +33,8 @@ storage:
           [Network]
           Address=fd00:0:0:2::102/64
           Address=2001:470:7116:2::102/64
-          Gateway=2001:470:7116:2::3
+          #Gateway=2001:470:7116:2::3
+          Gateway=fd00:0:0:2::3
           DNS=fd00:0:0:1::1
           Address=10.0.2.102/24
           Gateway=10.0.2.3
@@ -56,6 +57,7 @@ storage:
           2001:470:7116:2::101 worker1.undercloud.local worker1
           2001:470:7116:2::102 worker2.undercloud.local worker2
           2001:470:7116:2::103 worker3.undercloud.local worker3
+          2001:470:7116:2::104 worker4.undercloud.local worker4
 
           fd00:0:0:2::91      control-plane1.undercloud.local control-plane1
           fd00:0:0:2::92      control-plane2.undercloud.local control-plane2
@@ -63,6 +65,7 @@ storage:
           fd00:0:0:2::101     worker1.undercloud.local worker1
           fd00:0:0:2::102     worker2.undercloud.local worker2
           fd00:0:0:2::103     worker3.undercloud.local worker3
+          fd00:0:0:2::104     worker4.undercloud.local worker4
 
           10.0.2.91   control-plane1.undercloud.local control-plane1
           10.0.2.92   control-plane2.undercloud.local control-plane2
@@ -70,6 +73,7 @@ storage:
           10.0.2.101  worker1.undercloud.local worker1
           10.0.2.102  worker2.undercloud.local worker2
           10.0.2.103  worker3.undercloud.local worker3
+          10.0.2.104  worker4.undercloud.local worker4
 
     - path: /etc/motd
       mode: 0644
@@ -109,6 +113,7 @@ storage:
           fs.inotify.max_user_instances       = 4096
           kernel.panic                        = 10
           kernel.panic_on_oops                = 1
+          net.ipv6.conf.all.accept_ra         = 2
 
     - path: /etc/flatcar/update.conf
       overwrite: true
@@ -271,3 +276,30 @@ systemd:
 
         [Install]
         WantedBy=multi-user.target
+
+    - name: ping-all.service
+      enabled: true
+      contents: |
+        [Unit]
+        Description=Ping cluster nodes every 5 seconds
+        After=network-online.target
+        Wants=network-online.target
+
+        [Service]
+        Type=simple
+        ExecStart=/usr/bin/bash -c '\
+        while true; do \
+        ping -c1 -W1 fd00:0:0:2::91; \
+        ping -c1 -W1 fd00:0:0:2::92; \
+        ping -c1 -W1 fd00:0:0:2::93; \
+        ping -c1 -W1 fd00:0:0:2::101; \
+        ping -c1 -W1 fd00:0:0:2::102; \
+        ping -c1 -W1 fd00:0:0:2::103; \
+        ping -c1 -W1 fd00:0:0:2::104; \
+        sleep 5; \
+        done'
+        Restart=always
+        RestartSec=5
+
+        [Install]
+        WantedBy=multi-user.target
diff --git a/terraform/worker3.bu b/terraform/worker3.bu
index d0e5657..57c2374 100644
--- a/terraform/worker3.bu
+++ b/terraform/worker3.bu
@@ -33,7 +33,8 @@ storage:
           [Network]
           Address=fd00:0:0:2::103/64
           Address=2001:470:7116:2::103/64
-          Gateway=2001:470:7116:2::3
+          #Gateway=2001:470:7116:2::3
+          Gateway=fd00:0:0:2::3
           DNS=fd00:0:0:1::1
           Address=10.0.2.103/24
           Gateway=10.0.2.3
@@ -56,6 +57,7 @@ storage:
           2001:470:7116:2::101 worker1.undercloud.local worker1
           2001:470:7116:2::102 worker2.undercloud.local worker2
           2001:470:7116:2::103 worker3.undercloud.local worker3
+          2001:470:7116:2::104 worker4.undercloud.local worker4
 
           fd00:0:0:2::91      control-plane1.undercloud.local control-plane1
           fd00:0:0:2::92      control-plane2.undercloud.local control-plane2
@@ -63,6 +65,7 @@ storage:
           fd00:0:0:2::101     worker1.undercloud.local worker1
           fd00:0:0:2::102     worker2.undercloud.local worker2
           fd00:0:0:2::103     worker3.undercloud.local worker3
+          fd00:0:0:2::104     worker4.undercloud.local worker4
 
           10.0.2.91   control-plane1.undercloud.local control-plane1
           10.0.2.92   control-plane2.undercloud.local control-plane2
@@ -70,6 +73,7 @@ storage:
           10.0.2.101  worker1.undercloud.local worker1
           10.0.2.102  worker2.undercloud.local worker2
           10.0.2.103  worker3.undercloud.local worker3
+          10.0.2.104  worker4.undercloud.local worker4
 
     - path: /etc/motd
       mode: 0644
@@ -109,6 +113,7 @@ storage:
           fs.inotify.max_user_instances       = 4096
           kernel.panic                        = 10
           kernel.panic_on_oops                = 1
+          net.ipv6.conf.all.accept_ra         = 2
 
     - path: /etc/flatcar/update.conf
       overwrite: true
@@ -271,3 +276,30 @@ systemd:
 
         [Install]
         WantedBy=multi-user.target
+
+    - name: ping-all.service
+      enabled: true
+      contents: |
+        [Unit]
+        Description=Ping cluster nodes every 5 seconds
+        After=network-online.target
+        Wants=network-online.target
+
+        [Service]
+        Type=simple
+        ExecStart=/usr/bin/bash -c '\
+        while true; do \
+        ping -c1 -W1 fd00:0:0:2::91; \
+        ping -c1 -W1 fd00:0:0:2::92; \
+        ping -c1 -W1 fd00:0:0:2::93; \
+        ping -c1 -W1 fd00:0:0:2::101; \
+        ping -c1 -W1 fd00:0:0:2::102; \
+        ping -c1 -W1 fd00:0:0:2::103; \
+        ping -c1 -W1 fd00:0:0:2::104; \
+        sleep 5; \
+        done'
+        Restart=always
+        RestartSec=5
+
+        [Install]
+        WantedBy=multi-user.target
diff --git a/terraform/worker4.bu b/terraform/worker4.bu
index 1c459d4..7807351 100644
--- a/terraform/worker4.bu
+++ b/terraform/worker4.bu
@@ -33,7 +33,8 @@ storage:
           [Network]
           Address=fd00:0:0:2::104/64
           Address=2001:470:7116:2::104/64
-          Gateway=2001:470:7116:2::3
+          #Gateway=2001:470:7116:2::3
+          Gateway=fd00:0:0:2::3
           DNS=fd00:0:0:1::1
           Address=10.0.2.104/24
           Gateway=10.0.2.3
@@ -112,6 +113,7 @@ storage:
           fs.inotify.max_user_instances       = 4096
           kernel.panic                        = 10
           kernel.panic_on_oops                = 1
+          net.ipv6.conf.all.accept_ra         = 2
 
     - path: /etc/flatcar/update.conf
       overwrite: true
@@ -274,3 +276,30 @@ systemd:
 
         [Install]
         WantedBy=multi-user.target
+
+    - name: ping-all.service
+      enabled: true
+      contents: |
+        [Unit]
+        Description=Ping cluster nodes every 5 seconds
+        After=network-online.target
+        Wants=network-online.target
+
+        [Service]
+        Type=simple
+        ExecStart=/usr/bin/bash -c '\
+        while true; do \
+        ping -c1 -W1 fd00:0:0:2::91; \
+        ping -c1 -W1 fd00:0:0:2::92; \
+        ping -c1 -W1 fd00:0:0:2::93; \
+        ping -c1 -W1 fd00:0:0:2::101; \
+        ping -c1 -W1 fd00:0:0:2::102; \
+        ping -c1 -W1 fd00:0:0:2::103; \
+        ping -c1 -W1 fd00:0:0:2::104; \
+        sleep 5; \
+        done'
+        Restart=always
+        RestartSec=5
+
+        [Install]
+        WantedBy=multi-user.target