D-Link DSR-250N - Russia L2 TP and PPTP WAN; Figure 23: WAN Configuration for Multiple Pppoe (Part 2)

Unified Services Router User Manual
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When Japanese multiple PPPoE is configured and secondary connection is up, some predefined routes are added
on that interface. These routes are needed to access the internal domain of the ISP where he hosts various
services. These routes can even be configured through the static routing page as well.
Figure 23: WAN configuration for Multiple PPPoE (part 2)
3.2.5 Russia L2TP and PPTP WAN
For Russia L2TP WAN connections, you can choose the address mode of the connection to get an IP
address from the ISP or configure a static IP address provided by the ISP. For DHCP client
connections, you can choose the MAC address of the router to register with the ISP. In some cases
you may need to clone the LAN host’s MAC address if the ISP is registered with that LAN host.