In 2.4.0 I compiled an intel driver for enterprise grade Quad Intel Gigabit NIC's.
I packaged them as an RPM (easy to install).
They are detected as
Ethernet controller: Intel Corporation 82576 Gigabit Network Connection (rev 01)It works nicely, not even a hiccup on like 8 months. And I use the 4 ports with VLAN's, bonding, etc etc
The problem? It was compiled for kernel PAE on Endian 2.4.0. I don't think it will work on 2.4.1
So your best move will be install the developer tools on 2.4.1, download the igb sources from intel, compile and install it.
http://www.intel.com/support/network/adapter/pro100/sb/CS-032498.htm