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UFW (Uncomplicated Firewall) Question

I was wondering if there's any benefit of adding following rules to a Raspberry-Pi directly exposed to the internet: sudo ufw deny to 0.0.0.0/8 && sudo ufw deny to 169.254.0.0/16 && ...
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Would an RP3 do well as a firewall appliance?

I have seen this post about the Raspberry Pi for use as an IDS. But how well would it do as a firewall appliance in a residential setting? I will soon be setting up a new network and want to exercise ...
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How to block traffic coming from an “public” WiFi hotspot and going to the LAN (iptables)

I followed this tutorial (http://elinux.org/RPI-Wireless-Hotspot) for an Wifi Hotspot in the guesthouse. This is working fine, but every device on the WiFi network can reach any LAN device in the LAN ...