Dear experts,

I asked a question some weeks ago regarding sharing bandwidth among several WAN 
interfaces.  Tom answered that my problem was because of having an "ancient" 
version of Ubuntu.  Now the latest Ubuntu 8.04 LTS has come out, and I have 
been attempting to upgrade, but have run into an apparent bug that prevents the 
LAN from receiving internet through the PPPoE lines.  While that is an Ubuntu 
bug, apparently, and no concern of this list, I've run into some online advice 
that brings me to some questions regarding shorewall.  The advice I found said 
to clear the iptables with such commands as these:

sudo iptables -F
sudo iptables -X
sudo iptables -P INPUT ACCEPT
sudo iptables -P OUTPUT ACCEPT

The instructions were that this would completely open up the iptables, and 
would require a firewall to take care of the security in place of the iptables.

But now I ask:
1) Is this safe?
2) Does shorewall replace ALL of the necessary iptables rules with its own 
secure policies, or does it merely adjust the tables already there?
3) Would there be any better way of opening up the iptables?

If you're interested in the background issue with Ubuntu that I'm dealing with, 
and the advice I found online, you may look here:

http://ubuntuforums.org/showthread.php?t=781744&highlight=linux+pppoe+ERROR+while+getting+interface+flags%26quot%3B+%26quot%3B70-persistent-net.rules

Thank you!
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