The igb driver shipped with the Debian Lenny kernel (2.6.26-2) does not support the Intel 82576 Gigabit controller.
The ASL Driver CD (v5.07 or higher) provides a DKMS driver package to enable the 82576 NIC. After installing the system from the CD/DVD perform the following steps:
# apt-get install gcc make linux-headers-2.6.26-2-amd64 # mount /dev/cdrom /media # dpkg -i /media/Debian/Lenny/*dkms*.deb # umount /media
Afterward, edit /etc/network/interfaces to enable the interface. For example:
auto eth0 iface eth0 inet dhcp
To install packages via the internet, add the following lines to /etc/apt/sources.list:
deb http://ftp.us.debian.org/debian/ lenny main deb-src http://ftp.us.debian.org/debian/ lenny main
Future Debian Lenny kernels (>= 2.6.27) will not require this special package.