diff --git a/usr/local/www/interfaces.php b/usr/local/www/interfaces.php
index 58304d6ec7..9cf592e583 100755
--- a/usr/local/www/interfaces.php
+++ b/usr/local/www/interfaces.php
@@ -186,7 +186,7 @@ switch($wancfg['ipaddr']) {
 		$pconfig['type'] = "pptp";
 		break;
 	case "ppp":
-		$pconfig['type'] = "none";
+		$pconfig['type'] = "ppp";
 		break;
 	default:
 		if(is_ipaddr($wancfg['ipaddr'])) {
@@ -200,10 +200,6 @@ switch($wancfg['ipaddr']) {
 		break;
 }
 
-// Handle PPP type interfaces
-if($wancfg['serialport']) 
-	$pconfig['type'] = "none";
-
 $pconfig['blockpriv'] = isset($wancfg['blockpriv']);
 $pconfig['blockbogons'] = isset($wancfg['blockbogons']);
 $pconfig['spoofmac'] = $wancfg['spoofmac'];
@@ -470,7 +466,8 @@ if ($_POST) {
 		}
 	}
 	if (!$input_errors) {
-		unset($wancfg['ipaddr']);
+		if ($wancfg['ipaddr'] != "ppp")
+			unset($wancfg['ipaddr']);
 		unset($wancfg['subnet']);
 		unset($wancfg['gateway']);
 		unset($wancfg['dhcphostname']);
diff --git a/usr/local/www/interfaces_assign.php b/usr/local/www/interfaces_assign.php
index 605fdad7b5..663be60bdf 100755
--- a/usr/local/www/interfaces_assign.php
+++ b/usr/local/www/interfaces_assign.php
@@ -201,7 +201,7 @@ if ($_POST['apply']) {
 						$reloadif = true;
 					}
 					$config['interfaces'][$ifname]['if'] = $ifport;
-					if (preg_match('/^ppp[0-9]+/',$ifport)){
+					if (file_exists("/dev/{$ifport}")) {
 						$config['interfaces'][$ifname]['if'] =  basename($portlist[$ifport]['port']);
 						$config['interfaces'][$ifname]['ipaddr'] = "ppp";
 					}