Revision as of 16:14, 18 July 2009

Info

The following script should be created when you wish to update your ChangeIP.com Dynamic DNS account. Once created you should schedule this to run once in a while. The :global variables should be edited to include your unique username and password, interface name, etc. The script here should allow auto-detection of the default gateways interface name. This script below can be used if you have more than 1 WAN connection, but only 1 is active at a time.

This script will work as is, just navigate to System/Scripts and run it. This particular script works good with a 5 minute interval to update your Dynamic DNS with a scheduler.

Setup

For this script to function correctly, there are a few things that will need to be setup. Not necessary, but always good to have in place.

• Routerboard Identity Setup rb_Identity
• Routerboard Time Setup, either manually rb_time_manual or via NTP rb_ntp_setup

Enhancements

• Check out Dynamic DNS Schedule to create a schedule, that will run the script at a predefined period.

Script

# Define User Variables
:global ddnsuser "username"
:global ddnspass "password"
:global ddnshost "Host Name"

# 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
:log info "DDNS: End"