Change Domain Controler IP Address

First, modify /etc/network/interfaces and /etc/hosts files with the new IP.

If you have two or more domain controllers, modify /etc/krb5.conf file.

Check /etc/resolv.conf file if needed and the DNS forward set in /etc/samba/smb.conf.

Check if /var/lib/samba/private/krb5.conf is a symbolic link of /etc/krb5.conf.

Reboot the server. Samba will reconfigure him self with the new IP address.

You can check if DNS response are correct with the command :

dig @localhost srvads.domain.lan
dig @localhost domain.lan

Modify the reverse DNS if needed.