diff --git a/includes/defaults.inc.php b/includes/defaults.inc.php
index 7831d127c..a010d1e9a 100644
--- a/includes/defaults.inc.php
+++ b/includes/defaults.inc.php
@@ -245,6 +245,7 @@ $config['bad_iftype'][] = "atmSubInterface";
 $config['bad_iftype'][] = "aal5";
 $config['bad_iftype'][] = "shdsl";
 $config['bad_iftype'][] = "mpls";
+
 $config['bad_if_regexp'][] = "/^ng[0-9]+$/";
 $config['bad_if_regexp'][] = "/^sl[0-9]/";
 
diff --git a/includes/discovery/os/acsw.inc.php b/includes/discovery/os/acsw.inc.php
new file mode 100644
index 000000000..a20b3ab35
--- /dev/null
+++ b/includes/discovery/os/acsw.inc.php
@@ -0,0 +1,8 @@
+<?php
+
+if (!$os)
+{
+  if (strstr($sysObjectId, ".1.3.6.1.4.1.9.1.1291")) { $os = "acsw"; }
+}
+
+?>