cisco gigabit switch no internet with AT&t arris bgw210-700
I'm using AT&t arris bgw210-700 gateway for AT&T internet connection. I just setup cisco SG112-24 24-Port Gigabit Switch connecting with the bedroom ethernet port, so that I can get more ports for wired connections. However, even green lights are on in the switch, there is no internet when I launch a browser. The home internet is working fine without the switch. Any ideas? Are there any configurations I need to do in the gateway admin console? Please advise. thanks!!