2000 server that is a primary domain controller  &  a 2000 server second  domain controller  . The  primary domain controller crashed and had to be reinstall the operating system  restored the backup . Would not not bootup the primary domain controller. During this time the second  domain controller is still operational however  its not the  master. during  this  time it allowed to  added user and  user can log on the network. Now. 6-7 months later the server primary domain controller  was restarted and booted up. Now the backup is from nov 07 and the only promblem now is tcp will not stay in properties I type  the orinal IP I get access to AD but when close out properties it goes back  obtain ip automatic. I do a ipconfig it's the correct IP 255 and so on. I did  remove the  drivers of the  nic restalled driver still goes back to obtain ip automatic. Now  the  second question I have the recoved primary domain controller is on a diffrent  lan what would happen to  the second  domain controller  if I add  it to  the lan of the primary domain controller that has not  run since nov 07? The the second  domain controller  may 08 has 3 new  user compared to primary domain controller  from  nov  07