@StephenL TL-SG3428X is a L2+ switch. It cannot do "IP forwarding" as a L3 switch. So I gave up configuring the switch with VLANs and subnets. It is impossible to forward packets between VLANs with...

@Hank21 Thanks for your advice. I have set the default gateways. After studying the specifications of the L2+ switch, I have found that this switch does not support IP forwarding. So I gave up...

I am setting up TL-SG3428X and expect to connect the following subnets using inter-VLAN routing. VLAN1 port 1-28, subnet 10.120.225.x, port 1 connected to another switch which connects to a router to...