diff --git a/src/nm-types.h b/src/nm-types.h
index 52ae04c848..c4cae7618c 100644
--- a/src/nm-types.h
+++ b/src/nm-types.h
@@ -46,6 +46,10 @@ typedef struct _NMSleepMonitor       NMSleepMonitor;
 typedef enum {
 	/* In priority order; higher number == higher priority */
 	NM_IP_CONFIG_SOURCE_UNKNOWN,
+
+	/* platform internal flag used to mark routes with protocol RTPROT_KERNEL. */
+	_NM_IP_CONFIG_SOURCE_RTPROT_KERNEL,
+
 	NM_IP_CONFIG_SOURCE_KERNEL,
 	NM_IP_CONFIG_SOURCE_SHARED,
 	NM_IP_CONFIG_SOURCE_IP4LL,
diff --git a/src/platform/nm-linux-platform.c b/src/platform/nm-linux-platform.c
index 12591faf47..d6cf033fd4 100644
--- a/src/platform/nm-linux-platform.c
+++ b/src/platform/nm-linux-platform.c
@@ -1277,6 +1277,7 @@ source_to_rtprot (NMIPConfigSource source)
 	case NM_IP_CONFIG_SOURCE_UNKNOWN:
 		return RTPROT_UNSPEC;
 	case NM_IP_CONFIG_SOURCE_KERNEL:
+	case _NM_IP_CONFIG_SOURCE_RTPROT_KERNEL:
 		return RTPROT_KERNEL;
 	case NM_IP_CONFIG_SOURCE_DHCP:
 		return RTPROT_DHCP;
@@ -1289,13 +1290,16 @@ source_to_rtprot (NMIPConfigSource source)
 }
 
 static NMIPConfigSource
-rtprot_to_source (guint rtprot)
+rtprot_to_source (guint rtprot, gboolean preserve_rtprot)
 {
 	switch (rtprot) {
 	case RTPROT_UNSPEC:
 		return NM_IP_CONFIG_SOURCE_UNKNOWN;
-	case RTPROT_REDIRECT:
 	case RTPROT_KERNEL:
+		if (preserve_rtprot)
+			return _NM_IP_CONFIG_SOURCE_RTPROT_KERNEL;
+		/* fall through */
+	case RTPROT_REDIRECT:
 		return NM_IP_CONFIG_SOURCE_KERNEL;
 	case RTPROT_RA:
 		return NM_IP_CONFIG_SOURCE_RDISC;
@@ -1352,7 +1356,7 @@ init_ip4_route (NMPlatformIP4Route *route, struct rtnl_route *rtnlroute)
 	}
 	route->metric = rtnl_route_get_priority (rtnlroute);
 	rtnl_route_get_metric (rtnlroute, RTAX_ADVMSS, &route->mss);
-	route->source = rtprot_to_source (rtnl_route_get_protocol (rtnlroute));
+	route->source = rtprot_to_source (rtnl_route_get_protocol (rtnlroute), FALSE);
 	route->scope_inv = nm_platform_route_scope_inv (rtnl_route_get_scope (rtnlroute));
 
 	return TRUE;
@@ -1393,7 +1397,7 @@ init_ip6_route (NMPlatformIP6Route *route, struct rtnl_route *rtnlroute)
 	}
 	route->metric = rtnl_route_get_priority (rtnlroute);
 	rtnl_route_get_metric (rtnlroute, RTAX_ADVMSS, &route->mss);
-	route->source = rtprot_to_source (rtnl_route_get_protocol (rtnlroute));
+	route->source = rtprot_to_source (rtnl_route_get_protocol (rtnlroute), FALSE);
 
 	return TRUE;
 }
diff --git a/src/platform/nm-platform.c b/src/platform/nm-platform.c
index 580a706ee0..d09dbd1a7e 100644
--- a/src/platform/nm-platform.c
+++ b/src/platform/nm-platform.c
@@ -2588,6 +2588,8 @@ static const char *
 source_to_string (NMIPConfigSource source)
 {
 	switch (source) {
+	case _NM_IP_CONFIG_SOURCE_RTPROT_KERNEL:
+		return "rtprot-kernel";
 	case NM_IP_CONFIG_SOURCE_KERNEL:
 		return "kernel";
 	case NM_IP_CONFIG_SOURCE_SHARED: