to get eth1 up at boot, type this into your text editor:
case "$1" in
*insert the commands you run in the command line after boot here*
ifconfig eth1 down
echo "Please provide start or stop when running this script"
save it as something like "eth1_at_boot.sh", and in the same directory run (as root):
chmod 755 eth1_at_boot.sh
mv eth1_at_boot.sh /etc/init.d/
update-rc.d eth1_at_boot.sh defaults
If you find a better way to do it just run
update-rc.d -f eth1_at_boot.sh remove
remember if you name it something different substitute that filename for the one I wrote in the post
Hope that helps!