If so, you need two switches. Dial up the Internet with a router, configure the route on the router, and divide the switch into three or four VLANs, that is, three or four network segments. The client only needs to join VLAN and equip it with ip and gateway, mainly because the router also needs to dial. Anyway, it's very troublesome. Just find a professional to equip you. There are more than 30 sets.