Did a grep for the IP address that needs to be changed recursively in /var/lib/machines/nsdc and here is what found:
/var/lib/machines/nsdc/var/lib/samba/private/dns_update_cache:A nsdc-dc2.(domainname).int 192.168.2.10
/var/lib/machines/nsdc/var/lib/samba/private/dns_update_cache:A (domainname).int 192.168.2.10
/var/lib/machines/nsdc/var/lib/samba/private/dns_update_cache:A gc._msdcs.(domainname).int 192.168.2.10
/var/lib/machines/nsdc/var/lib/samba/private/dns_update_cache:A DomainDnsZones.(domainname).int 192.168.2.10
/var/lib/machines/nsdc/var/lib/samba/private/dns_update_cache:A ForestDnsZones.(domainname).int 192.168.2.10