I've been trying to set up a TP-link TD-9970 in bridge mode so i can use it as a modem and have my Linksys wrt1900acs do the routing. However, I cant get it to work. On the TD-9970 I've tried having a single interface bridging the dsl connection with my ISP specific VPI and VCI. I've tried setting up a bridge interface with VLAN. I've tried having both interfaces on at the same time. nothing worked. The wrt1900acs is still unable to detect an internet connection.