diff --git a/config.php.default b/config.php.default
index 2a73fff409..5b7f64acd9 100755
--- a/config.php.default
+++ b/config.php.default
@@ -34,8 +34,10 @@ $config['snmp']['community'] = array("public");
 $config['auth_mechanism'] = "mysql"; # default, other options: ldap, http-auth
 #$config['http_auth_guest'] = "guest"; # remember to configure this user if you use http-auth
 
-### List of networks to allow scanning-based discovery
-$config['nets'][] = "172.22.0.0/16";
-$config['nets'][] = "192.168.0.0/24";
+### List of RFC1918 networks to allow scanning-based discovery
+$config['nets'][] = "10.0.0.0/8";
+$config['nets'][] = "172.16.0.0/12";
+$config['nets'][] = "192.168.0.0/16";
+
 
 ?>