diff --git a/overlay/rro_packages/NetworkStackOverlay/res/values/config.xml b/overlay/rro_packages/NetworkStackOverlay/res/values/config.xml
index aef5c9ca1131053143bd6c7ceb926d4f4350b972..c1cf4fd7c6a80d61db7b88239c35908738f640f3 100644
--- a/overlay/rro_packages/NetworkStackOverlay/res/values/config.xml
+++ b/overlay/rro_packages/NetworkStackOverlay/res/values/config.xml
@@ -19,4 +19,16 @@
     <!-- Configuration for including DHCP client hostname option -->
     <bool name="config_dhcp_client_hostname">true</bool>
 
+    <!-- HTTP URL for network validation, to use for detecting captive portals. -->
+    <string name="config_captive_portal_http_url" translatable="false">http://connectivity.ecloud.global</string>
+
+    <!-- HTTPS URL for network validation, to use for confirming internet connectivity. -->
+    <string name="config_captive_portal_https_url" translatable="false">https://connectivity.ecloud.global</string>
+
+    <!-- List of fallback URLs to use for detecting captive portals. -->
+    <string-array name="config_captive_portal_fallback_urls" translatable="false">
+        <item>http://204.ecloud.global</item>
+        <item>http://ecloud.global/generate_204</item>
+    </string-array>
+
 </resources>