IP Address Change for entire network

My company want to change the whole entire network  range to  125.1.XXX.XXX to 192.168.XXX.XXX .now I am assign to this job ,I already plan to upgrade the firewall,domain controller ,mail server.may I know how to change the DNS server , active directory
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Paul MacDonaldDirector, Information SystemsCommented:
AD won't care and neither will DNS, strictly speaking.  You may have to update records in DNS about SOA, WINS and name servers, but that's only to speed things along.  

I'm guessing most of your clients are DHCP so they'll take care of themselves.  Regardless, you'll want to plan on doing this over a weekend, and nothing much else getting done until things settle down.
Darius GhassemCommented:
If you are changing your DC IP make sure you run ipconfig /flushdns, ipconfig /regsiterdns, and dcdiag /fix.
Don't forget about all your routers, printers, firewalls, and other network devices.  Anything that has a static IP will need to be manually updated.
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warriorsTeahAuthor Commented:
So is mean I no need  touch any configuration in DNS  server  I just run a command do will fo fix every things?
Darius GhassemCommented:
With your DCs if you run those commands everything should update properly
A few questions to get things clear.

Do you have multiple sites?
Do you use vlans?
Who manages your routers/firewalls?
How many nodes (workstations/printers/etc/etc..) are we talking about?
If I understand correct your migrating from 125.1.xxx.xxx to 192.168.xxx.xxx, correct?

With these questions answered we can give you better answers.
DC and DNS are one thing, you need to make changes to all your ip owning devices (e.g. printers, etc)
What would help is use DNS as much as possible so you only need to make address changes only in one place.
warriorsTeahAuthor Commented:
Answer to the question above
4.All is use fix IP we will change also

Please try me more about what i need to change in our domain controller ,DNS, DHCP .Thank you
If you have more than one domain controller, you may want to do a split scope:


I don't believe you'll have to modify DNS on your server at all.  Here are the things you need to look at.  All are part of DHCP:

Add a new address pool and set it to the range of addresses that you want to hand out.  I wouldn't include the portion of your network which has static IP.

Scope Options:
DNS Servers (make sure these are pointing to the new IP address of your DNS Server(s).
Router (make sure it's pointing to your firewall\gateway)

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warriorsTeahAuthor Commented:
I know ,I need to make changer in firewall,how about routers?
Hello, can you be more specific as to which routers you are talking about?  Most routers and switches will have a static ip so yes you will have to log into them and manually change the IP.
Paul MacDonaldDirector, Information SystemsCommented:
You may need to make changes in your firewall/routers if they're filtering, NATing, or otherwise manipulating traffic based on IP address.
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