diff --git a/roles/kube-master/tasks/patch_netconf.py b/roles/kube-master/tasks/patch_netconf.py
new file mode 100644
index 0000000..4250bb9
--- /dev/null
+++ b/roles/kube-master/tasks/patch_netconf.py
@@ -0,0 +1,21 @@
+#!/usr/bin/env python3
+from ruamel.yaml import YAML
+
+yaml = YAML()
+yaml.preserve_quotes = True
+
+with open("/tmp/kube-flannel.yml", "r") as f:
+    docs = list(yaml.load_all(f))
+
+for doc in docs:
+    if doc.get("kind") == "ConfigMap" and doc.get("metadata", {}).get("name") == "kube-flannel-cfg":
+        doc["data"]["net-conf.json"] = '''{
+  "Network": "192.168.3.0/16",
+  "Backend": {
+    "Type": "vxlan"
+  },
+  "Interface": "eth1"
+}'''
+
+with open("/tmp/kube-flannel.yml", "w") as f:
+    yaml.dump_all(docs, f)
\ No newline at end of file