I think we can indeed use it as a switch (still unsure). However, the problem is the SonicWALL has to be configured with the WAN gateway and WAN IP address of the modem in order to work. Unfortunately, since in one case we're using a Comcast modem for which the ISP assigns IP addresses dynamically, we have no such static IP address for the modem to use for that. So how in the world do I get around that?