Thanks coca koala, the configuration is as sugested, made from scratch several times. Maybe hardware/firmware is too old? 741 is V2 and 841 is V7 both with latest available firmware

Region : Brazil Model : Archer C9 Hardware Version : Not Clear Firmware Version : 3.16.29 Build 20150122 Rel.64222n ISP : NET VIRTUA I have some TP-LINK Wireless routers,TL-WR741ND, TL-WR841N,...