Newbie ez-ipupdate/startup question

Hi there--

I'm using the ez-ipupdate tool successfully to update my DNS settings
on easydns.com. I would like to automate it to run once on startup,
and am looking for advice on the best way to do this. (I'm running on
Fedora Core 3.)

Currently, I have:
/usr/sbin/ez-ipupdate

and:
/etc/ez-ipudate/settings.conf

both readable and executable by root.

In my /etc/rc.d/rc.local file, I've added this line:
/usr/sbin/ez-ipudate -c /etc/ez-ipupdate/settings.conf

When I run this (logged in as root) from a command line, it executes
correctly. But when I reboot and let it run from the startup, it seems
to complain about access to the /etc/ez-ipupdate/settings.conf file.

I assume that I have permissions/user-account issues, but I'm not sure
where to look.

Any advice?

Thanks.

-dave