Here's a Linux Journal article on building diskless firewall systems. "Because we're going to build a Linux system completely from scratch, we need a fair amount of software. The usual Linux tools aren't built for embedded systems, they're loaded with features we don't need. This is where BusyBox, the Swiss Army knife of embedded Linux, comes into play. We can exchange most of our needed tools with BusyBox, for instance a shell, ifconfig, ip tools and so on."

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