Coding with a teddy bear in your lap helps immensely.

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IPtables for the v2.4 Linux kernel series doesn't understand virtual interfaces (a.k.a. IP Aliasing). If you've never seen this before you can take one interface, say eth0, and bind an IP address to it, for example 192.168.1.1. Under the v2.4 kernel series you can bind more than one IP address to an interface, which creates a virtual network interface. If I bound a second address (10.0.0.1) to our network interface above you'd see in the output of /sbin/ifconfig eth0 …