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I was trying to write up an iptables script last night and managed to get it work, or so I thought.

When I run it, the interface just dies.

It's still configured and "up", but any kind of traffic sent to it is ignored. I even added lines like:
iptables -A INPUT -i $IFACE -j LOG
and I don't get any logging in /var/log/syslog

What's worse, if I remove all the rules and reset the default policy to ACCEPT it doesn't get any better.

Is there some "issue" between iptables and the 2.6 kernel I should know about?
Is there any way I might be able to trouble shoot this effectively?

Right now my only option is to reboot the machine entirely to get it working again. This can't be right.

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