diff --git a/ansible/roles/k3s-agent/defaults/main.yml b/ansible/roles/k3s-agent/defaults/main.yml
index ca68a29..06decf1 100644
--- a/ansible/roles/k3s-agent/defaults/main.yml
+++ b/ansible/roles/k3s-agent/defaults/main.yml
@@ -4,4 +4,4 @@ k3s_server_url: ""
 k3s_token: ""
 k3s_node_ip: ""
 k3s_kubelet_cloud_provider_external: false
-k3s_flannel_iface: ens18
+k3s_flannel_iface: "{{ ansible_default_ipv4.interface | default('eth0') }}"
diff --git a/ansible/roles/k3s-server/defaults/main.yml b/ansible/roles/k3s-server/defaults/main.yml
index cd17ead..cc083ff 100644
--- a/ansible/roles/k3s-server/defaults/main.yml
+++ b/ansible/roles/k3s-server/defaults/main.yml
@@ -6,7 +6,7 @@ k3s_primary_public_ip: ""
 k3s_disable_embedded_ccm: false
 k3s_disable_servicelb: true
 k3s_kubelet_cloud_provider_external: false
-k3s_flannel_iface: ens18
+k3s_flannel_iface: "{{ ansible_default_ipv4.interface | default('eth0') }}"
 # Load Balancer endpoint for HA cluster joins (set in inventory)
 kube_api_endpoint: ""
 # Tailscale DNS names for control planes (to enable tailnet access)
diff --git a/ansible/roles/kube-vip-deploy/defaults/main.yml b/ansible/roles/kube-vip-deploy/defaults/main.yml
index 6094644..d70b311 100644
--- a/ansible/roles/kube-vip-deploy/defaults/main.yml
+++ b/ansible/roles/kube-vip-deploy/defaults/main.yml
@@ -1,4 +1,4 @@
 ---
 kube_vip_version: v1.1.2
-kube_vip_interface: ens18
+kube_vip_interface: "{{ ansible_default_ipv4.interface | default('eth0') }}"
 kube_vip_address: "{{ kube_api_endpoint }}"