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+---
+title: mikrotik
+---
+
+1. Script for DDNS
+
+Create the following script with name `TanDNS` and the following permissions `write, test, read, policy`
+```
+# Tanshu automatic DNS updates
+
+# User account info
+:local user "user"
+:local pass "123456"
+
+# Set the hostname or label of network to be updated.
+:local host "home.tanshu.com"
+
+# Change to the name of interface that gets the changing IP address
+:local inetinterface "pppoe-out1"
+
+#- No more changes need -------------------------------------------------------------
+:global previousIP;
+
+:if ([/interface get $inetinterface value-name=running]) do={
+# Get the current IP on the interface
+    :local currentIP [/ip address get [find interface="$inetinterface" disabled=no] address];
+    
+# Strip the net mask off the IP address
+    :for i from=( [:len $currentIP] - 1) to=0 do={
+        :if ( [:pick $currentIP $i] = "/") do={ 
+            :set currentIP [:pick $currentIP 0 $i]
+        }
+    }
+
+    :if ($currentIP != $previousIP) do={
+        :log info "TanDNS: Update needed"
+        :set previousIP $currentIP
+
+# The update URL. Note the "\3F" is hex for question mark (?). Required since ? is a special character in commands.
+        :local url "http://bifrost.tanshu.com/update\3Fdomain=$host"
+        :log info "TanDNS: Sending update for $host"
+        /tool fetch url=$url user=$user password=$pass mode=http dst-path=("TanDNSupdate-" . $host . ".txt")
+        :log info "TanDNS: Host $host updated on TanDNS with IP $currentIP"
+    }  else={
+        :log info "TanDNS: Previous IP $previousIP and current IP equal, no update need"
+    }
+} else={
+    :log info "TanDNS: $inetinterface is not currently running, so therefore will not update."
+}```
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