DHCP - new sub net and failover relationship

[Eudora931]

Hi,

Would appreciate any tips/ heads up for the situation I have found myself in...long story .. But ..

I have someone coming in on Monday to do some sub netting 1) to create more IP's 2) to switch from broadband provider 1 to BB provider 2

 

Current setup is : 2 dc's being replicated with a failover relationship

 

Several key devices with static IP's that will be given IP's from the new subnet before the subnet is created. ( using IP's from a range that currently exists and will also be part of the new subnet )

 

The proposal is to delete the current DHCP scope (which is a Superscope ) and create a new one .

Questions: will the devices with the current static IP addresses (as long as they are also in new range ) still work?

How do we make sure the replication and failover relationship works ? Will it have to be set up again?

 

Not an expert on this level so ANY help advice, tips, gotchas very much appreciated .

Would have liked to have more time to do this properly , but hand has been forced and neither of the people who set it up initially are available :-(

Sincere thanks in advance

[ITGuyWestMidlands]

What are you changing to and from?

[Eudora931]

What are you changing to and from?

 

From a 255 to a 252 ...

[ITGuyWestMidlands]

Ok. The devices with static ips will only be able to talk to devices in their own subnet. You will need to change them.

[Eudora931]

Do you mean change the subnet masks for those statics - IE can I keep the IP address the same? ( one of the new ranges will be the same as one the statics are currently on)

[ITGuyWestMidlands]

Yes from what you have said i believe so

[Eudora931]

Thanks for taking the time to reply ITGuy ... Really appreciate it ... It's going to be a nervous day tomorrow ..

[Scrambles]

What we like to do here is for things like printers or android devices or other that need a static IP, we create a DHCP reservation for them

On server 2012r2 you can use PowerShell to import DHCP reservations in bulk

We still do it manually for servers however, but thats just a handful of servers compared to like ... 60 odd other devcies that would need to be manually changed.

[Eudora931]

I have 4 virtual servers on 2 hyper v hosts and one physical. 2 x dc's which are replicated ( for DHCP failover) and a fileserver that is replicated across the 2 dc's . Is there a preferred order in which we should change the mask on each of the server nic's? What about the hosts?

2x main printers and then about 6 hp's across the school.

Devices are things like the digital signage and more importantly the secure door access and cctv .

Each of the statics have reservations.

[Eudora931]

Big day today ! Eek ! I have to believe that it's all going to go well ...

[Eudora931]

So, all went well ... Thanks for the replies that put me at ease about the transition :-)

[ITGuyWestMidlands]

Good news. Well done