Quoting Raymond Norton (admin at support.lctn.k12.mn.us):
> I am using the attached script on my local LAN, on a RedHat 7.1 box. At
> first it works great for everything I need, but either time or maybe use
> will cause it to stop working, and not allow any Internet traffic through.
> The RedHat box looses Internet too. I have stopped the script, restarted
> iptables, and then launched the script again, but it whines about not being
> able to get an IP address on eth0. If I restart the box, and script,
> everything works great for a while.

Is eth0 statically assigned or dhcp assigned?

Is eth0 your public interface or private interface?

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