I would suggest copying off the static IP and resetting the router to factory defaults. What AT&T did to the internal configuration neither fixed your internet connection nor caused your failures to connect to the AC3. The internal network (and addresses) are totally isolated from the public network (and addresses) through something in the router callet NAT (network address translation); in short NAT translated private (or internal addressed) into accessable addresses from the internal at the same time taking internet requests from in-house network and routing then through the router. In short the router is the only connection to the outside (computers connect to the router, the router exchanges information from the internet.
The above assumes you have DHCP turned on (which you should if you are using a router. You also need to be suer that the 1st 3 octets are the same for everything on the in-house network. If you don't then you need to muck with the Net Mask (which in effect tells network devices what parts of the IP address they need to process.
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