谢谢!我的ISP不是PPPOE,看到以下: https://forum.mikrotik.com/viewtopic.php?t=123913
a) If you want to give other addresses to different servers, you can bridge/switch their ports with WAN and let them get their addresses directly.
b) If you want all addresses on router, there's VRRP hack. As the name suggests, it's not exactly proper solution, but it works.