diff --git a/defaults/main.yaml b/defaults/main.yaml
index 2e45245..ad50cff 100644
--- a/defaults/main.yaml
+++ b/defaults/main.yaml
@@ -2,3 +2,6 @@
 # use 'network-scripts' for network-scripts and lo iface for BGP IPs 
 network: "nm"
 network_nm_iface: "dummy0"
+
+# null for auto
+network_nm_iface_mtu: null
diff --git a/tasks/RedHat/8.yaml b/tasks/RedHat/8.yaml
index e187143..81bd984 100644
--- a/tasks/RedHat/8.yaml
+++ b/tasks/RedHat/8.yaml
@@ -18,23 +18,28 @@
       - Restart loopback
   when: network == 'network-scripts'
 
-- name: Add dummy interface and add IPs
-  community.general.nmcli:
-    type: dummy
-    conn_name: "{{ network_nm_iface }}"
-    ip4: |
-      [
-      {% set ips = [] %}
-      {% for protocol_static in bird.bgp.static %}
-      {% for network in protocol_static['networks'][ansible_fqdn] %}
-      {{ ips.append(network['ip'] + '/' + network['mask_dash']) }}
-      {% endfor %}
-      {% endfor %}
-      "{{ ips | join(',') }}"
-      ]
-    state: present
-  notify:
-    - Reload dummy interface
+
+- block:
+  - name: BGP IPs string for nmcli
+    set_fact:
+      ips: |-
+        {%- set ips_list = [] %}
+        {%- for protocol_static in bird.bgp.static %}
+        {%- for network in protocol_static['networks'][ansible_fqdn] %}
+        {{ ips_list.append(network['ip'] + '/' + network['mask_dash']) }}
+        {%- endfor %}
+        {%- endfor %}
+        {{ ips_list | join(', ') }}
+        
+  - name: Add dummy interface and add IPs
+    community.general.nmcli:
+      type: dummy
+      conn_name: "{{ network_nm_iface }}"
+      ip4: "{{ ips }}"
+      mtu: "{{ network_nm_iface_mtu }}"
+      state: present
+    notify:
+      - Reload dummy interface
   when: network == 'nm'
 
 - name: Add BIRD config
@@ -50,4 +55,3 @@
     state: started
     enabled: yes
     daemon_reload: yes
-