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Change IP address of the DC

Introduction

This HowTo describes a way to change the IP address of your DC.

General


Changing the IP address of your DC can cause unexprected side effects! Always make sure you have a recoverable backup! And of course do intensive testing!

Notice: This HowTo was tested only in a single DC environment!

Changing the IP address of the DC


Preconditions

Make sure, that no clients are connected to the server, while you do the changes. They'll be disconnected and won't reconnect until the next reboot!

 # ifconfig eth0:0 10.99.0.200 up
 interfaces = lo eth0 eth0:0

This parameter is not used per default. If you made changes to your smb.conf, restart Samba!

 # samba_dnsupdate --verbose
 Failed to find matching DNS entry A samdom.example.com 10.12.2.71
 Failed to find matching DNS entry A dc1.samdom.example.com 10.12.2.71
 Failed to find matching DNS entry A gc._msdcs.samdom.example.com 10.12.2.71

Remember these records. We'll change them in the next step.

 # ifconfig eth0:0 down

Notice: You have to restart all Windows clients, that where up during the IP change, because the OS had cached the old values.! Otherwise these clients won't connect to the new IP.