diff --git a/global-functions b/global-functions
index 2ff1f43..d7ee6b8 100644
--- a/global-functions
+++ b/global-functions
@@ -24,6 +24,7 @@
 :global CleanFilePath;
 :global DefaultRouteIsReachable;
 :global DeviceInfo;
+:global DNSIsResolving;
 :global DownloadPackage;
 :global GetMacVendor;
 :global GetRandom;
@@ -218,6 +219,16 @@
   :return $Info;
 }
 
+# check if DNS is resolving
+:set DNSIsResolving do={
+  :do {
+    :resolve mikrotik.com;
+    :return true;
+  } on-error={
+    :return false;
+  }
+}
+
 # download package from upgrade server
 :set DownloadPackage do={
   :local PkgName [ :tostr $1 ];