[PfSense 2.0] DDNS on FailOver of 2 WAN

[Chebec]

Hi,
is possible to insert this script:
http://www.freebsdwiki.net/index.php/BIND,_dynamic_DNS,_failover_A_records#Installing_and_running_the_crontab
in PfSense 2.0 ??

I don't want use a DynDNS client to sync a dynamic IP connection,
I want sync a DynDNS when the failover swich my connection.

Thanks to all