I have following scenario.
Windows 2008 R2 base Active Directory DC (DC1), which is hosting DNS+ DHCP too. (previously it was on windows 2003 32bit, i migrated it last year on 2008 r2 64bit). Also there are two ADC's , one with Windows 2003 (DC2), and second with Windows 2008r2 (DC3).
The problem is that when the DC reboot, DNS donot work for about 20-25 minutes. When i try to do nslookup on client or even on the dc , it gives me unknown server, and no resolving done. Active directory and users groups also not open.
After 15-20 minutes everything starts to work fine. in DC LAN properties, I have preferred dns server pointing to DC itself, and secondary to other ADC.
I have also tried to do nslookup on other ADC's but they also donot respond. When the main DC start working, ADC also works fine. So the concept of having ADC in case of...