@NikosK You can use Windows CMD to ping your DNS server. Like ping 8.8.8.8. If it shows timeout as well, then your network should has problem. About your ISP, did he provide any DNS server? You can...

@Burczymucha According to you configuration, port 24 is untagged for VLAN1, right? When you access the gateway, the data will go thorugh VLAN1. So the main switch will receive the untagged packets...

I think it's hard to achieve seamless for link backup. Because your backup WAN will take times for changing status to online and getting IP address. Maybe you can consider to use policy routing and...

Maybe your switch only supports up to 12 entries for MAC VLAN. If so, haven't method to fix it.

@ykzamorpheus Do you mean your WAN2 is disconnected and you need to re-plug the cable to make it work? If so, you can check if you set Link Backup or any other function. Link Backup will make your...

@RicRey I misunderstand your netowrk in the last post. So now you want to use TL-SG3216 in your network, and need to know how to configure the switch, right? The switch has many function,...