Description of Problem:
When the "most secure" firewall installation option is checked,
DNS doesn't work on a DHCP'd ethernet.

Version-Release number of selected component (if applicable):
initscripts-6.90-1

How Reproducible:
Very.

Steps to Reproduce:
1. Install null from scratch.
2. Chose the most secure of the firewall settings.
3. Configure ethernet as DHCP
4. Try to access something by name.

Actual Results:
timeout


Expected Results:
success

Additional Information:
It looks like the chain that you add -A to is already denying all UDP traffic,
so appending a rule that allows the DNS servers to send UDP packets doesn't do
anything useful.

It appears that changing "-A" to "-I" in
/etc/sysconfig/network-scripts/ifup-post fixes this problem.  There's also a
"-A" in /sbin/ifup.  I naively changed that from "-A" to "-I" on my first
attempt to solve the problem and that didn't help by itself, but I didn't bother
to change it back before I changed ifup-post.  I figure you guys know the
scripts much better than I do, so it makes more sense for you to find the
"right" fix.