I have been using TP-Link TL-WR740N Wireless Router in my Home to connect Wi-Fi devices. It is working fine for few months without any problem. I went on vacation for 7 days and when I back I noticed that my TP-Link router starting showing unable to resolve DNS Server when I tried to browse any websites. Initially, I thought it is problem with my Internet Service Provider (ISP). So I contacted my ISP (BSNL) to fix this problem. But the settings are fine, and now I am unable to fix this problem. Please, help me how to fix this issue.
I have setup switches with LACP LAGs between all the key points that are available in the network. But before, I have connected a USB cable from Airport Extreme LAN port to the Airport Express WAN port. Actually, I was using Airport Express as a wired repeater for the Airport Extreme. Is anyone has used USB cable with VLAN trunk, actually I want to know how to extend Airport express network over a VLAN?