# Set needed variables
       :local username "fiosdfhgsdfg"
       :local password "koikerterteroi"
       :local hostname "tertertger.dyndns.org"
       :local waninterface "pppoe-fibre"
       :local pingTarget 8.8.8.8

       :global dyndnsForce
       :global previousIP
       #:global dyndnsLock

       # print some debug info
       #:log info ("UpdateDynDNS: username = $username")
       #:log info ("UpdateDynDNS: password = $password")
       #:log info ("UpdateDynDNS: hostname = $hostname")

       # Lock avoiding double execution
       #:if ([ :typeof $dyndnsLock ] = nil ) do={
       #    :set dyndnsLock false
       #}
       #:if ($dyndnsLock = true) do={
       #    :log warning ("UpdateDynDNS: script-dynDNS already running")
       #    :error "UpdateDynDNS: script-dynDNS already running"
       #}

       # set the lock
       #:set dyndnsLock true

       # test WAN link, so that no crash when trying to reach http
       :if ([/ping $pingTarget interval=2 count=3]!=3) do={
           :log warning ("UpdateDynDNS: WAN target unreachable ($pingTarget)")
       # free the lock
       #    :set IPtoGMAILLock false
           :error "UpdateDynDNS: WAN target unreachable ($pingTarget)"
       }
       # disabled because web server doesn't not answer to ping requests
       #:set pingTarget [:resolve members.dyndns.org server=$pingTarget]
       #:if ([/ping $pingTarget interval=2 count=3]!=3) do={
       #    :log warning ("UpdateDynDNS: WAN target unreachable ($pingTarget)")
       # free the lock
       #    :set IPtoGMAILLock false
       #    :error "UpdateDynDNS: WAN target unreachable ($pingTarget)"
       #}

       # get the current IP address from
       :local currentNET [/ip address get [/ip address find interface=$waninterface] address]
       :local currentIP [ :pick $currentNET 0 [ :find $currentNET "/" ] ]

       # Remove the # on next line to force an update every single time - useful for debugging, but you could end up getting blacklisted by DynDNS!
       #:set dyndnsForce true

       # Determine if dyndns update is needed
       # more dyndns updater request details available at http://www.dyndns.com/developers/specs/syntax.html
       # Did we get an IP address to compare?
       :if ([ :typeof $currentIP ] = nil ) do={
          :log info ("UpdateDynDNS: No ip address present on " . $waninterface . ", please check.")
       } else={

           :if (($dyndnsForce = true) || ([ :typeof $previousIP ] = nil) || ($currentIP != $previousIP)) do={
               :set dyndnsForce false
               :log info ("UpdateDynDNS: Dyndns update needed")
               :log info ("UpdateDynDNS: previousIP = $previousIP --> currentIP = $currentIP")
               /tool fetch user=$username password=$password mode=http address="members.dyndns.org" src-path="/nic/update\?hostname=$hostname&myip=$currentIP" dst-path="/dyndns.txt"
               :set previousIP $currentIP
               :local result [/file get dyndns.txt contents]
               :log info ("UpdateDynDNS: Dyndns Update Result: ".$result)
               :put ("Dyndns Update Result: ".$result)
           } else={
       #        :log info ("UpdateDynDNS: No dyndns update needed")
           }
       }

       # free the lock
       #:set dyndnsLock false