I've had some experience with a couple of DSL modems(from Siemens & Intracom) and both used PPPoE to perform the connection.
The best thing they had was the fact that they had both a USB port and an ethernet port as a PC-Modem interface.
The only problems so far were only caused by the fact that parts of the network(phone lines) are quite old.
Both modems had a dhcp option(disable, dhcp server, routing data to an external dhcp).
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