I have a problem with using MacBook Pro as wifi router when connected to ethernet

I have a problem with using MacBook Pro as wifi router when connected to ethernet. The Airport icon changes to show a laptop inside, my iPad shows connected (I think) but Safari will not operate. I tried pinging my iPad, it seems to see the iPad, but no connection to Safari or to other apps such as Good on the iPad. I have read many posting and tried repeatedly via Sharing in Systems Preferences, but no luck. Suggestions to fix, or is this a Lion problem?

Usually this is a problem related to the domain name server address. If you open Network preferences, select your Ethernet port then click on the Advanced button then on the DNS tab. You will likely see an entry like 10.0.1.1 already listed. Click on the Add [-] button and enter 208.67.222.222 then click on the OK button and then on the Apply button.  See if this helps.
if it does not help then repeat the above but with the Airport port.

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