Doug:
OK. I must be in a parallel universe. I have the exact same problem.
I just installed e-smith over an old RedHat installation. My system meets the Category_2 configuration as detailed in the user manual. My NICs are on the approved list, and work in other machines. The SME Server works fine as an internal server. However, it will not perform functions as a gateway because the second NIC -- eth1 -- fails to install. Swapping the NICs just causes the other NIC to not install.
Please let me know if you find anything solution to this problem. Likewise, I will keep hunting and will post anything I find here.
Best regards,
Scruf