grav/pages/07.mikrotik-ddns/docs.md

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---
title: 'mikrotik DDNS'
---
#### 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 keep-result=no
: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."
}
```
#### 2. Schedule the script
Create the following schedule with name `TanDNS-Update` and the following permissions `write, test, read, policy`, `5 minute` interval and `TanDNS` On Event.