HP Officejet Pro L7580 not recognized and unable to install

Hello everyone,

We purchased a MacBook Pro and for sometime we had it connected to our HP Officejet Pro L7580 using its usb connection. This MacBook Pro is running Mountain Lion software with the current printer update. We moved and relocated our printer to a more suitable room. In our house we have two routers. Our main router is Actiontec MI424-WR and the secondary router is Dlink DIR 655. The Dlink is connected lan-to-lan with Actiontec. The printer is connected to Dlink router which is downstairs. I have spent considerable amount of time figuring out why our MacBook Pro doesn't recognize this printer. We have other computers at home that runs in unix (Ubuntu) and windows (Windows 7) and those computers are able to print, scan, and fax to this computer without problems. The connections to all computers are the same which is wireless. I have read a lot post in this community and as well as HP community and it doesn't provide any solution to this problem. I am able to ping this printer from the MacBook with no problem. When I install this printer using ip method the scan option is not there. However if I bring the computer downstairs and install it using usb the scan option appears. I am thinking that HP didn't provide a driver for scan option if you're connected wireless or ethernet. But I found out that the current drivers for mountain lion for this particular printer has a scan capability. I need some help in figuring out what's going on with this. I would like to be able to scan using this laptop where I don't have to physically connect it to the scanner. I am completely lost with Mac.