RouterOS DynDNS Script

gistfile1.txt

:local username "username"
:local password "password"
:local hostname "hostname"

:global forceUpdate
:global previousIP

:local currentIP [/ip address get [find interface="ether1-gateway"] address];

:for i from=([:len $currentIP] - 1) to=0 do={
    :if ([:pick $currentIP $i] = "/") do={
        :set currentIP [:pick $currentIP 0 $i]
    }
}

#:set forceUpdate true

:if (($currentIP != $previousIP) || ($forceUpdate = true)) do={
   :set forceUpdate false
   :set previousIP $currentIP
   /tool fetch user=$username password=$password mode=http address="members.dyndns.org" src-path="nic/update?system=dyndns&hostname=$hostname&myip=$currentIP&wildcard=no" dst-path="/dyndns.txt"
}