how do I access my modem

We can help you access your modem, NASmith.

You can sign in to your modem by opening a Chrome, Firefox, Internet Explorer, or other browser window, and entering http://192.168.1.254.

Please elaborate on your comment about duplicate IP addresses for further assistance.

Aminah, AT&T Community Specialist

Why won't Chromecast work with this internet?

what does chromecast have to do with accessing the modem 

Let's get your Chromecast connected, @rceccc06! 

If your Chromecast is having trouble connecting to the internet, we recommend restarting your gateway to refresh the connection.

1. Unplug the power cord from the back of your gateway or modem. If you have:
   • An internal battery backup, remove it.
   • DSL service, unplug your telephone cord from your modem or gateway
2. Wait 20 seconds.
3. Put the internal battery back in, if applicable.
4. Plug the power cord back in. If you have DSL service, reconnect the telephone cord.
5. Wait up to 10 minutes for the gateway or modem to restart and your Broadband light to turn solid green.

If this doesn't help, you may want to try setting up port forwarding if your device allows it. This can help connect 3rd party equipment to your network. Just select your model of gateway from the dropdown to get personalized instructions!

If none of this helps, please elaborate on what's going on with your Chromecast, so we can provide more personalized suggestions. 

Raiden, AT&T Community Specailist