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:global ddnsuser “southbird”

:global ddnspass “mothana”

:global ddnshost “00.00.00.00”

# Define Global Variables

:global ddnsip

:global ddnslastip

:if ([ :typeof $ddnslastip ] = nil ) do={ :global ddnslastip “0” }

:global ddnsinterface

:global ddnssystem (“mt-” . [/system package get system version] )

# Define Local Variables

:local int

# Loop thru interfaces and look for ones containing

# default gateways without routing-marks

:foreach int in=[/ip route find dst-address=0.0.0.0/0 active=yes ] do={

:if ([:typeof [/ip route get $int routing-mark ]] != str ) do={

:global ddnsinterface [/ip route get $int interface] }

}

# Grab the current IP address on that interface.

:global ddnsip [ /ip address get [/ip address find interface=$ddnsinterface ] address ]

# Did we get an IP address to compare?

:if ([ :typeof $ddnsip ] = nil ) do={

:log info (“DDNS: No ip address present on ” . $ddnsinterface . “, please check.”)

} else={

:if ($ddnsip != $ddnslastip) do={

:log info “DDNS: Sending UPDATE!”

:log info [ :put [/tool dns-update name=$ddnshost address=[:pick $ddnsip 0 [:find $ddnsip “/”] ] key-name=$ddnsuser key=$ddnspass ] ] :global ddnslastip $ddnsip

} else={

:log info “DDNS: No update required.”

}

}

# End of script