diff --git a/conf_schema.c b/conf_schema.c
index 4abf8b35..ad22e9c7 100644
--- a/conf_schema.c
+++ b/conf_schema.c
@@ -989,6 +989,20 @@ int vld_network_interface(const struct cf_om_node *parent, struct config_network
       cf_warn_missing_node(parent, "file");
       return result | CFSUB(CFINCOMPATIBLE);
     }
+    if (nifp->socket_type != SOCK_FILE){
+      int nodei_drop=-1;
+      if (nifp->drop_packets)
+	nodei_drop=cf_om_get_child(parent, "drop_packets", NULL);
+      if (nifp->drop_broadcasts)
+	nodei_drop=cf_om_get_child(parent, "drop_broadcasts", NULL);
+      if (nifp->drop_unicasts)
+	nodei_drop=cf_om_get_child(parent, "drop_unicasts", NULL);
+      if (nodei_drop!=-1){
+	int nodei_socket_type=cf_om_get_child(parent, "socket_type", NULL);
+	cf_warn_incompatible(parent->nodv[nodei_socket_type], parent->nodv[nodei_drop]);
+	return result | CFSUB(CFINCOMPATIBLE);
+      }
+    }
   }
   return result;
 }
diff --git a/tests/config b/tests/config
index 1873743b..09045fc9 100755
--- a/tests/config
+++ b/tests/config
@@ -254,10 +254,6 @@ doc_InterfacesModernDummy="Modern 'interfaces.N.file' config option"
 test_InterfacesModernDummy() {
    executeOk_servald config set interfaces.0.file dummyname
 }
-teardown_InterfacesModernDummy() {
-   tfw_cat $SERVALINSTANCE_PATH/serval.conf
-   teardown
-}
 
 doc_InterfacesModernIncompatible="Config options 'interfaces.match' and 'interfaces.file' are incompatible"
 test_InterfacesModernIncompatible() {
@@ -270,4 +266,17 @@ test_InterfacesModernIncompatible() {
       --error-pattern='config file.*loaded despite defects.*incompatible'
 }
 
+doc_InterfaceDropDgramIncompatible="Config options 'interfaces.drop_packets' and 'interfaces.socket_type=DGRAM' are incompatible"
+test_InterfaceDropDgramIncompatible() {
+   executeOk_servald config \
+      set interfaces.0.match eth \
+      set interfaces.0.socket_type dgram
+   execute --stderr --core-backtrace --executable=$servald \
+      config set interfaces.0.drop_packets 10
+   assertExitStatus '==' 2
+   assert_stderr_log \
+      --warn-pattern='"interfaces\.0\..*incompatible' \
+      --error-pattern='config file.*loaded despite defects.*incompatible'
+}
+
 runTests "$@"