Revision as of 18:50, 18 July 2009

Info

The following script example should be created to update your ChangeIP.com or MyDDns.com Dynamic DNS account. Once created you should schedule this to run once in a while. The :local 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

# MyDDns International Account

# Local user variables
:local DnsUser "enter your MyDDns username here"
:local DnsPass "enter your MyDDns password here"
:local DnsHost "enter your MyDDns hostname here"
:local DnsInterface "enter your PPPoE interface name here"

# Global user variables
# if you have another PPPoE account with this script you need to change LastDnsIpInter to something unique; search/replace
:global LastDnsIpInter

:if ([ :typeof $LastDnsIpInter ] = nil) do={ :global LastDnsIpInter "0"}

# Get the current Ip Address
:local DnsIp [/ip address get [/ip address find interface=$DnsInterface] address ]

# Check for updates
:if ([ :typeof $DnsIp ] = nil ) do={
  :log info ("DynDns: No Ip address present on ". $DnsInterface )
} else={
  :local NewIp [ :pick $DnsIp 0 [ :find $DnsIp "/" ] ]  
  :if ($NewIp != $LastDnsIpInter) do={
    :log info ("DynDns: ". $DnsInterface ." Sending update.")
    :local DnsResult ( [ :put [ /tool dns-update name=$DnsHost address=$NewIp key-name=$DnsUser key=$DnsPass ] ] )
    :global LastDnsIpInter $NewIp
  } else={
# Uncomment the line below if you want to see when updates aren't needed  
#    :log info "DynDns: ($DnsInterface) No update needed"
  }
}