Cisco SG300. How to organize access from several vlan to the Internet?

Question

Cisco

Gentlemen, I'm interested in solving the problem.
There is an sg300 switch, several vlans (101, 102, 103) created in it, a router with Internet access is connected to vlan 101.
Question. How to organize access of computers from different vlans to the Internet, while they must remain isolated from each other (vlans)?

Answer 1

Set up a trunk between the router and the switch. On the router, create subinterfaces for each vlan. Hang up access sheets to prohibit traffic between vlans. To access the Internet, add nat to subinterfaces.

Answer 2

Not in the usual way. SG300 - L2 switch, you can't do routing on it. But you can poke around ProxyArp