Connect via ethernet but wireless for internet

I don't know why, but my apple tv seems to have forgotten how to connect to the internet and I can't make it remember, lol. Now I will stress, this used to work, and I don't know why it suddenly doesn't work anymore...
Basically I have wireless set up at home for the internet. However, I connect to my apple tv via direct ethernet cable between my imac and the apple tv itself. I have set up internet sharing in preferences to share my airport connection over ethernet, which my apple tv used to be able to use ok to connect to the itunes store/you tube, etc. However, it now can't. I had some trouble with it this morning where it wouldn't connect to the ethernet network at all, although it now does. However, it no longer uses the iMac as it's router and I can't seem to figure out why. Can anyone help?
Thanks!

Chris Johnson2 wrote:
We have one MBP (10.5.8) that is able to connect to our network via Ethernet and use all services. But, when it connects via Airport, it will connect to the wireless router, but will not connect to the Internet or the network...
You might try the three suggestions in the second message of this thread:
http://discussions.apple.com/message.jspa?messageID=10445592

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