diff --git a/roles/k3s_server_post/defaults/main.yml b/roles/k3s_server_post/defaults/main.yml
index 578e557..ec4d74d 100644
--- a/roles/k3s_server_post/defaults/main.yml
+++ b/roles/k3s_server_post/defaults/main.yml
@@ -30,3 +30,4 @@ metal_lb_mode: layer2
 metal_lb_available_timeout: 240s
 metal_lb_controller_tag_version: v0.14.3
 metal_lb_ip_range: 192.168.30.80-192.168.30.90
+metal_lb_interfaces:
diff --git a/roles/k3s_server_post/templates/metallb.crs.j2 b/roles/k3s_server_post/templates/metallb.crs.j2
index 562f561..0cf917a 100644
--- a/roles/k3s_server_post/templates/metallb.crs.j2
+++ b/roles/k3s_server_post/templates/metallb.crs.j2
@@ -21,6 +21,13 @@ kind: L2Advertisement
 metadata:
   name: default
   namespace: metallb-system
+{% if metal_lb_interfaces %}
+spec:
+  interfaces:
+  {% for interface in metal_lb_interfaces %}
+    - {{ interface }}
+  {% endfor %}
+{% endif %}
 {% endif %}
 {% if metal_lb_mode == "bgp" %}
 ---