Ran into problems with a RCA cable modem/router just several days ago. Couldn't even get a link light with a Watchguard SOHO firewall. The ISP refused to help with the problem. Might want to make certain that the ISP will support the "free" hardware you get in case you run into problems. (To finally solve the problem we installed a different cable modem/router and had to set it to the duplex and speed of the port on the firewall).
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Ran into problems with a RCA cable modem/router just several days ago. Couldn't even get a link light with a Watchguard SOHO firewall. The ISP refused to help with the problem. Might want to make certain that the ISP will support the "free" hardware you get in case you run into problems. (To finally solve the problem we installed a different cable modem/router and had to set it to the duplex and speed of the port on the firewall).