3 files changed, 23 insertions, 5 deletions

diff --git a/usr/local/www/interfaces_lan.php b/usr/local/www/interfaces_lan.php
index ae17f30..73de5d3 100755
--- a/usr/local/www/interfaces_lan.php
+++ b/usr/local/www/interfaces_lan.php
@@ -123,7 +123,7 @@ include("head.inc");
 <script language="JavaScript">
 <!--
 function ipaddr_change() {
-	document.iform.subnet.value = gen_bits(document.iform.ipaddr.value);
+	document.iform.subnet.value = gen_bits_lan(document.iform.ipaddr.value);
 }
 // -->
 </script>
diff --git a/usr/local/www/interfaces_opt.php b/usr/local/www/interfaces_opt.php
index 97926eb..a6ab5c4 100755
--- a/usr/local/www/interfaces_opt.php
+++ b/usr/local/www/interfaces_opt.php
@@ -179,7 +179,7 @@ function enable_change(enable_over) {
 	document.iform.subnet.disabled = endis;
 }
 function ipaddr_change() {
-	document.iform.subnet.selectedIndex = gen_bits(document.iform.ipaddr.value);
+	document.iform.subnet.selectedIndex = gen_bits_opt(document.iform.ipaddr.value);
 }
 //-->
 </script>
diff --git a/usr/local/www/ip_helper.js b/usr/local/www/ip_helper.js
index 29e892f..8473cb2 100755
--- a/usr/local/www/ip_helper.js
+++ b/usr/local/www/ip_helper.js
@@ -1,4 +1,23 @@
-function gen_bits(ipaddr) {
+function gen_bits_lan(ipaddr) {
+    if (ipaddr.search(/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/) != -1) {
+        var adr = ipaddr.split(/\./);
+        if (adr[0] > 255 || adr[1] > 255 || adr[2] > 255 || adr[3] > 255)
+            return "";
+        if (adr[0] == 0 && adr[1] == 0 && adr[2] == 0 && adr[3] == 0)
+            return "";
+
+                if (adr[0] <= 127)
+                        return "8";
+                else if (adr[0] <= 191)
+                        return "16";
+                else
+                        return "24";
+    }
+    else
+        return "";
+}
+
+function gen_bits_opt(ipaddr) {
     if (ipaddr.search(/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/) != -1) {
         var adr = ipaddr.split(/\./);
         if (adr[0] > 255 || adr[1] > 255 || adr[2] > 255 || adr[3] > 255)
@@ -15,5 +34,4 @@ function gen_bits(ipaddr) {
     }
     else
         return 0;
-}
-
+}
\ No newline at end of file