Hello,
I have two routers.
Router1(ZTE) is connected to my ISP via PPPoE and the Router2(TP-LINK) is connected to Router1's ethernet port.
Cable from ethernet port of Router1 is connected to WAN port of Router2.
Router1's config (LAN Side):
ip : 192.168.1.1
subnet : 255.255.255.0
Router2's...