fix: do not manage Foreign Routes or Foreign Routing Rules

ansible/playbooks/cluster-prepare.yml

@@ -17,6 +17,7 @@
             name: "{{ timezone | default('Etc/UTC') }}"
 
     - name: Networking
+      notify: Restart systemd-networkd
       block:
         - name: Networking | Set hostname to inventory hostname
           ansible.builtin.hostname:
@@ -26,6 +27,17 @@
             path: /etc/hosts
             block: |
               127.0.1.1   {{ inventory_hostname }}
+        # https://github.com/cilium/cilium/issues/18706
+        - name: Network | Cilium (1)
+          ansible.builtin.lineinfile:
+            dest: /etc/systemd/networkd.conf
+            regexp: ManageForeignRoutingPolicyRules
+            line: ManageForeignRoutingPolicyRules=no
+        - name: Network Configuration | Cilium (2)
+          ansible.builtin.lineinfile:
+            dest: /etc/systemd/networkd.conf
+            regexp: ManageForeignRoutes
+            line: ManageForeignRoutes=no
 
     - name: Packages
       block:
@@ -123,6 +135,10 @@
       notify: Reboot
 
   handlers:
+    - name: Restart systemd-networkd
+      ansible.builtin.systemd:
+        service: systemd-networkd
+        state: restarted
     - name: Reboot
       ansible.builtin.reboot:
         msg: Rebooting nodes