WHS (including the bits I haven't quoted).
A friend of mine gave me a useful tip a few years ago: rather than staying with the default 192.168.1.x DHCP/NAT range, move your router's DHCP to somewhere else - say, 192.168.23.x, where the 23 can be any value from 1 to 255.
That way you are very unlikely to end up with DHCP conflicts when something that also has DHCP enabled connects to your network. Everything uses 1 as the default, which makes 192.168.1.x potentially a crowded neighbourhood.