Feature: Add fallback ip detection (#3296)

* Feature: Add fallback ip detection

* Update NetworkConnectionWidgetViewModel.cs

* Docs: #3296

* Update Dragablz

Author: BornToBeRoot

Source/3rdparty/Dragablz

@@ -10,6 +10,7 @@
 using System.Windows.Input;
 using log4net;
 using NetworkInterface = NETworkManager.Models.Network.NetworkInterface;
+using System.Net.Sockets;
 
 namespace NETworkManager.ViewModels;
 
@@ -760,6 +761,14 @@ private Task CheckConnectionComputerAsync(CancellationToken ct)
                 await NetworkInterface.DetectLocalIPAddressBasedOnRoutingAsync(
                     IPAddress.Parse(SettingsManager.Current.Dashboard_PublicIPv4Address));
 
+            if (detectedLocalIPv4Address == null)
+            {
+                Log.Debug("CheckConnectionComputerAsync - Local IPv4 address detection via routing failed, trying network interfaces...");
+
+                detectedLocalIPv4Address = await NetworkInterface.DetectLocalIPAddressFromNetworkInterfaceAsync(
+                    AddressFamily.InterNetwork);
+            }
+
             if (detectedLocalIPv4Address != null)
             {
                 Log.Debug("CheckConnectionComputerAsync - Local IPv4 address detected: " + detectedLocalIPv4Address);
@@ -787,6 +796,14 @@ await NetworkInterface.DetectLocalIPAddressBasedOnRoutingAsync(
                 await NetworkInterface.DetectLocalIPAddressBasedOnRoutingAsync(
                     IPAddress.Parse(SettingsManager.Current.Dashboard_PublicIPv6Address));
 
+            if (detectedLocalIPv6Address == null)
+            {
+                Log.Debug("CheckConnectionComputerAsync - Local IPv6 address detection via routing failed, trying network interfaces...");
+
+                detectedLocalIPv6Address = await NetworkInterface.DetectLocalIPAddressFromNetworkInterfaceAsync(
+                    AddressFamily.InterNetworkV6);
+            }
+
             if (detectedLocalIPv6Address != null)
             {
                 Log.Debug("CheckConnectionComputerAsync - Local IPv6 address detected: " + detectedLocalIPv6Address);
@@ -896,6 +913,9 @@ private Task CheckConnectionRouterAsync(CancellationToken ct)
                 await NetworkInterface.DetectLocalIPAddressBasedOnRoutingAsync(
                     IPAddress.Parse(SettingsManager.Current.Dashboard_PublicIPv4Address));
 
+            detectedLocalIPv4Address ??= await NetworkInterface.DetectLocalIPAddressFromNetworkInterfaceAsync(
+                AddressFamily.InterNetwork);
+
             if (detectedLocalIPv4Address != null)
             {
                 Log.Debug("CheckConnectionRouterAsync - Computer IPv4 address detected: " + detectedLocalIPv4Address);
@@ -939,6 +959,9 @@ await NetworkInterface.DetectGatewayFromLocalIPAddressAsync(
                 await NetworkInterface.DetectLocalIPAddressBasedOnRoutingAsync(
                     IPAddress.Parse(SettingsManager.Current.Dashboard_PublicIPv6Address));
 
+            detectedComputerIPv6 ??= await NetworkInterface.DetectLocalIPAddressFromNetworkInterfaceAsync(
+                AddressFamily.InterNetworkV6);
+
             if (detectedComputerIPv6 != null)
             {
                 Log.Debug("CheckConnectionRouterAsync - Computer IPv6 address detected: " + detectedComputerIPv6);

Source/NETworkManager/ViewModels/NetworkConnectionWidgetViewModel.cs

@@ -56,6 +56,10 @@ Release date: **xx.xx.2025**
 - Settings format migrated from `XML` to `JSON`. The settings file will be automatically converted on first start after the update. [#3282](https://github.com/BornToBeRoot/NETworkManager/pull/3282)
 - Create a daily backup of the settings file before saving changes. Up to `10` backup files are kept in the `Backups` subfolder of the settings directory. [#3283](https://github.com/BornToBeRoot/NETworkManager/pull/3283)
 
+**Dashboard**
+
+- Enhance local IP detection logic: If local IP cannot be determined via routing, now iterates over active network adapters and selects the first valid IPv4/IPv6 address (with link-local addresses (`169.254.x.x`, `fe80::..`) given lower priority). [#3296](https://github.com/BornToBeRoot/NETworkManager/pull/3296)
+
 **IP Scanner**
 
 - Improved local subnet detection: If local IP cannot be determined via routing, now iterates over active network adapters and selects the first valid IPv4 address (with link-local addresses (`169.254.x.x`) given lower priority). [#3288](https://github.com/BornToBeRoot/NETworkManager/pull/3288)