Good day. Such a thing, I decided to configure 2 TP-Link routers in bridge mode. Using your description of the configuration of the Tp-Link router in bridge mode (WDS) , everything was done. As a result: through the cable connected to the second TP-Link WR740N router, which is connected via WiFi Internet caught. But, WiFi is working strange. The laptop was connected only through QSS. The password does not accept, although everything checked, everything converges. Writes what is not the right pair.
Smartphones, respectively, also do not connect, writes an authentication error. 1st TP-Link MR3420 router.
The settings are as follows: on the 1st: the channel is static, IP reserved for the 2nd router, broadcast SSID is hidden. On the 2nd: DHCP is disabled, the channel is static. SSID is different, the password is the same. From the laptop I go to the 1st router, through the second without any problems, at least the cable, even the wifi ... Internet, the same way.