diff --git a/LibreNMS/Config.php b/LibreNMS/Config.php
index fd675f0d69..ebe4d24095 100644
--- a/LibreNMS/Config.php
+++ b/LibreNMS/Config.php
@@ -37,15 +37,6 @@ class Config
     public static function get($key, $default = null)
     {
         global $config;
-
-        if (isset($config[$key])) {
-            return $config[$key];
-        }
-
-        if (!str_contains($key, '.')) {
-            return $default;
-        }
-
         $keys = explode('.', $key);
 
         $curr = &$config;
@@ -99,18 +90,9 @@ class Config
      */
     public static function getOsSetting($os, $key, $default = null)
     {
-        global $config;
-
         if ($os) {
-            if (isset($config['os'][$os][$key])) {
-                return $config['os'][$os][$key];
-            }
-
-            if (!str_contains($key, '.')) {
-                return self::get($key, $default);
-            }
-
             $os_key = "os.$os.$key";
+
             if (self::has($os_key)) {
                 return self::get($os_key);
             }
@@ -131,21 +113,6 @@ class Config
      */
     public static function getCombined($os, $key, $default = array())
     {
-        global $config;
-
-        if (!self::has($key)) {
-            return self::get("os.$os.$key", $default);
-        }
-
-        if (!isset($config['os'][$os][$key])) {
-            if (!str_contains($key, '.')) {
-                return $default;
-            }
-            if (!self::has("os.$os.$key")) {
-                return self::get($key, $default);
-            }
-        }
-
         return array_unique(array_merge(
             (array)self::get($key, $default),
             (array)self::getOsSetting($os, $key, $default)
@@ -180,15 +147,6 @@ class Config
     public static function has($key)
     {
         global $config;
-
-        if (isset($config[$key])) {
-            return true;
-        }
-
-        if (!str_contains($key, '.')) {
-            return false;
-        }
-
         $keys = explode('.', $key);
         $last = array_pop($keys);
 
diff --git a/doc/Developing/os/Settings.md b/doc/Developing/os/Settings.md
index 0c024a4fc3..7ae5194626 100644
--- a/doc/Developing/os/Settings.md
+++ b/doc/Developing/os/Settings.md
@@ -11,28 +11,6 @@ For example, to set an alternate icon for ios:
 $config['os']['ios']['icon'] = 'fuzzybunny';
 ```
 
-### Ignoring Interfaces
-See also: [Global Ignoring Interfaces Config](../../Support/Configuration.md#interfaces-to-be-ignored)
-
-> These settings are merged with the global settings, so you can only undo global ones with good_if
-
-```yaml
-empty_ifdescr: false # allow empty ifDescr
-bad_if: # ifDescr (substring, case insensitive)
-    - lp0
-bad_if_regexp: # ifDescr (regex, case insensitive)
-    - "/^ng[0-9]+$/"
-bad_ifname_regexp: # ifName (regex, case insensitive)
-    - "/^xdsl_channel /"
-bad_ifalias_regexp: # ifAlias (regex, case insensitive)
-    - "/^vlan/"
-bad_iftype: # ifType (substring)
-    - sonet
-good_if: # ignore all other bad_if settings ifDescr (substring, case insensitive)
-    - virtual
-
-```
-
 
 ### Storage Settings
 See also: [Global Storage Config](../../Support/Configuration.md#storage-configuration)
diff --git a/includes/definitions/catos.yaml b/includes/definitions/catos.yaml
index 8fe6d9517d..95c9d993e9 100644
--- a/includes/definitions/catos.yaml
+++ b/includes/definitions/catos.yaml
@@ -32,5 +32,3 @@ discovery_modules:
 discovery:
     - sysDescr:
         - Cisco Catalyst Operating System Software
-bad_if:
-    - vlan
diff --git a/includes/definitions/dlink.yaml b/includes/definitions/dlink.yaml
index 48cbda40c3..b79ac92ae9 100644
--- a/includes/definitions/dlink.yaml
+++ b/includes/definitions/dlink.yaml
@@ -10,6 +10,3 @@ discovery:
     - sysDescr_regex:
         - '/^DES-/'
         - '/^DGS-/'
-good_if:
-    - po
-    - vlan
diff --git a/includes/functions.php b/includes/functions.php
index e736b62222..1f015a44ec 100644
--- a/includes/functions.php
+++ b/includes/functions.php
@@ -11,7 +11,6 @@
  *
  */
 
-use LibreNMS\Config;
 use LibreNMS\Exceptions\HostExistsException;
 use LibreNMS\Exceptions\HostIpExistsException;
 use LibreNMS\Exceptions\HostUnreachableException;
@@ -980,75 +979,95 @@ function include_dir($dir, $regex = "")
     }
 }
 
-/**
- * Check if port is valid to poll.
- * Settings: empty_ifdescr, good_if, bad_if, bad_if_regexp, bad_ifname_regexp, bad_ifalias_regexp, bad_iftype
- *
- * @param array $port
- * @param array $device
- * @return bool
- */
 function is_port_valid($port, $device)
 {
-    // check empty values first
-    if (empty($port['ifDescr'])) {
+
+    global $config;
+
+    if (empty($port['ifDescr']) && empty($port['ifAlias']) && empty($port['ifName'])) {
         // If these are all empty, we are just going to show blank names in the ui
-        if (empty($port['ifAlias']) && empty($port['ifName'])) {
-            return false;
+        $valid = 0;
+    } else {
+        $valid = 1;
+        $if = strtolower($port['ifDescr']);
+        $ifname = strtolower($port['ifName']);
+        $ifalias = strtolower($port['ifAlias']);
+        $fringe = $config['bad_if'];
+        if (is_array($config['os'][$device['os']]['bad_if'])) {
+            $fringe = array_merge($config['bad_if'], $config['os'][$device['os']]['bad_if']);
         }
-
-        // ifDescr should not be empty unless it is explicitly allowed
-        if (!Config::getOsSetting($device['os'], 'empty_ifdescr', false)) {
-            return false;
+        $config['good_if'] = $config['good_if'] ?: array();
+        if (is_array($config['os'][$device['os']]['good_if'])) {
+            $good_if = array_merge($config['good_if'], $config['os'][$device['os']]['good_if']);
+        }
+        foreach ($fringe as $bi) {
+            if (stristr($if, $bi)) {
+                if (!str_contains($good_if, $if)) {
+                    $valid = 0;
+                    d_echo("ignored : $bi : $if");
+                }
+            }
+        }
+        if (is_array($config['bad_if_regexp'])) {
+            $fringe = $config['bad_if_regexp'];
+            if (is_array($config['os'][$device['os']]['bad_if_regexp'])) {
+                $fringe = array_merge($config['bad_if_regexp'], $config['os'][$device['os']]['bad_if_regexp']);
+            }
+            foreach ($fringe as $bi) {
+                if (preg_match($bi ."i", $if)) {
+                    $valid = 0;
+                    d_echo("ignored : $bi : " . $if);
+                }
+            }
+        }
+        if (is_array($config['bad_ifname_regexp'])) {
+            $fringe = $config['bad_ifname_regexp'];
+            if (is_array($config['os'][$device['os']]['bad_ifname_regexp'])) {
+                $fringe = array_merge($config['bad_ifname_regexp'], $config['os'][$device['os']]['bad_ifname_regexp']);
+            }
+            foreach ($fringe as $bi) {
+                if (preg_match($bi ."i", $ifname)) {
+                    $valid = 0;
+                    d_echo("ignored : $bi : ".$ifname);
+                }
+            }
+        }
+        if (is_array($config['bad_ifalias_regexp'])) {
+            $fringe = $config['bad_ifalias_regexp'];
+            if (is_array($config['os'][$device['os']]['bad_ifalias_regexp'])) {
+                $fringe = array_merge($config['bad_ifalias_regexp'], $config['os'][$device['os']]['bad_ifalias_regexp']);
+            }
+            foreach ($fringe as $bi) {
+                if (preg_match($bi ."i", $ifalias)) {
+                    $valid = 0;
+                    d_echo("ignored : $bi : ".$ifalias);
+                }
+            }
+        }
+        if (is_array($config['bad_iftype'])) {
+            $fringe = $config['bad_iftype'];
+            if (is_array($config['os'][$device['os']]['bad_iftype'])) {
+                $fringe = array_merge($config['bad_iftype'], $config['os'][$device['os']]['bad_iftype']);
+            }
+            foreach ($fringe as $bi) {
+                if (stristr($port['ifType'], $bi)) {
+                    $valid = 0;
+                    d_echo("ignored ifType : ".$port['ifType']." (matched: ".$bi." )");
+                }
+            }
+        }
+        if (empty($port['ifDescr']) && !$config['os'][$device['os']]['empty_ifdescr']) {
+            $valid = 0;
+        }
+        if ($device['os'] == "catos" && strstr($if, "vlan")) {
+            $valid = 0;
+        }
+        if ($device['os'] == "dlink") {
+            $valid = 1;
         }
     }
 
-    $ifDescr = $port['ifDescr'];
-    $ifName  = $port['ifName'];
-    $ifAlias = $port['ifAlias'];
-    $ifType  = $port['ifType'];
-
-    if (str_contains($ifDescr, Config::getOsSetting($device['os'], 'good_if'), true)) {
-        return true;
-    }
-
-    foreach (Config::getCombined($device['os'], 'bad_if') as $bi) {
-        if (str_contains($ifDescr, $bi, true)) {
-            d_echo("ignored by ifDescr: $ifDescr (matched: $bi)\n");
-            return false;
-        }
-    }
-
-    foreach (Config::getCombined($device['os'], 'bad_if_regexp') as $bir) {
-        if (preg_match($bir ."i", $ifDescr)) {
-            d_echo("ignored by ifDescr: $ifDescr (matched: $bir)\n");
-            return false;
-        }
-    }
-
-    foreach (Config::getCombined($device['os'], 'bad_ifname_regexp') as $bnr) {
-        if (preg_match($bnr ."i", $ifName)) {
-            d_echo("ignored by ifName: $ifName (matched: $bnr)\n");
-            return false;
-        }
-    }
-
-
-    foreach (Config::getCombined($device['os'], 'bad_ifalias_regexp') as $bar) {
-        if (preg_match($bar ."i", $ifAlias)) {
-            d_echo("ignored by ifName: $ifAlias (matched: $bar)\n");
-            return false;
-        }
-    }
-
-    foreach (Config::getCombined($device['os'], 'bad_iftype') as $bt) {
-        if (str_contains($ifType, $bt)) {
-            d_echo("ignored by ifType: $ifType (matched: $bt )\n");
-            return false;
-        }
-    }
-
-    return true;
+    return $valid;
 }
 
 function scan_new_plugins()