no network after upgrade to feisty

Has the the boot process in Feisty been changed? I did a KUBUNTU upgrade to Feisty, and now after booting my computer does not get a network connection  from my router. If I then  do sudo /etc/init.d/networking restart, I get a network connection. Never had this problem in 5.05, 6.06 and 6.10.  System settings > system services says runlevel 2 : networking Start at boot: Yes