I don't know about the integrated NIC, but I had absolutely no luck with the latest revision of the LNE100TX card.  Have a look at the hardware section of Red Hat, and you'll see that the latest revision of the card is not supported in 7.0, and thus not in e-smith.  There may be a way to update the drivers, as the card is supported in 7.1 , but I found it easier to swap the LNE100TX with another older card.