Yes, that's right. ip address for the modem is 192.168.1.1 and I connected to port eth 1/1/1 which I assign ip 192.168.1.2. i can't ping ip 192.168.1.1 and any other ip addresses in the internet but i can ping 192.168.1.2 for everywhere from any vlans. i think that i can't route traffic from ip 192.168.1.1 to vlans. But i can ping any outside ip address from the switch console. I am don't know exactly what should be config of the port eth 1/1/1