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I have some home devices for Powerline ethernet and wireless bridging. They all are behind a main router that blocks out the outside world. On the power line nodes, I see a few things under iptables. I noticed that if I reset all iptables rules to defaults I end up getting better performance (and less dropped packets). Is there any reason to have the iptables rules on internal only devices? They are already protected by wifi WPA2 PSK as well as a main router that has a built in firewall.

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