(Sorry, my research blogging has been intermittent - but it does affect my documentation, so I am trying to be consistent about it.)
This morning, I needed to look at the DNS and DHCP servers on the Soekris box - somehow, it wasn't working perfectly.
The problem started when I first tried to install dhcpd (the DHCP server) last year without realizing dnsmasq had already been installed - and without knowing what dnsmasq is. After some frustrating error messages and doing some Google searches for dnsmasq and dhcpd, I finally found out more about how they work.
This article gives a good overview of how to set up dnsmasq.