Selecting any of the Trusted devices allows access to your system for all traffic from that device; it becomes excluded from the firewall rules. For example, if you are running a local network, but are connected to the Internet via a PPP dialup, you can check eth0 and any traffic coming from your local network is allowed. Selecting eth0 as trusted means all traffic over the Ethernet is allowed, but the ppp0 interface is still firewalled. To restrict traffic on an interface, leave it unchecked.
You may have noticed a sit0 device in the Trusted devices section. This device stands for simple internet transition, which encapsulates IPv6 traffic into IPv4 traffic, and then is tunneled. For basic firewall rules, this device can be ignored and left as an untrusted device.
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It is not recommended that you make any device that is connected to public networks, such as the Internet, a Trusted device.
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