If you get the error message 'SIOCADDRT: Invalid argument' at boot time: That comes from the command 'route add -net 127.0.0.0' or something similar normally placed in /etc/init.d/network. You can just remove this line as routing to interfaces are done automatically by the 2.2.x kernels. For more details see the networking section in CHANGES ( http://www.linuxhq.com/change21.html )).
It took me a while to find this out. :-) Bye, Steffen