diff --git a/elements/amphora-agent/static/etc/NetworkManager/conf.d/no-auto-default.conf b/elements/amphora-agent/static/etc/NetworkManager/conf.d/no-auto-default.conf
new file mode 100644
index 0000000000..8fce22d00c
--- /dev/null
+++ b/elements/amphora-agent/static/etc/NetworkManager/conf.d/no-auto-default.conf
@@ -0,0 +1,7 @@
+[main]
+# Disable auto configuration for newly detected devices.
+# This prevents having temporary addresses and routes in the default namespace
+# between the detection of a new devices and its move to the amphora-haproxy
+# namespace.
+# The management interface configuration is triggered by cloud-init.
+no-auto-default=*