Create "second" scope in same network(same ip range) 1

[DgtlLgk]

What i want to do:
i have a network lets say 10.0.0.0/24.I already have a scope lets say 10.0.0.100-10.0.0.150.Other pcs use static ip.Now lets say some ips are available for use again i.e.10.0.0.40-10.0.0.50.Now Those ips i want to assign them to some notebooks through mac address(not manually).I want to create a second scope(same range/subnet),so i will reserve those ips for those machines through mac address.Didn't try super scope to be honest(if it can be done).

 

[SimonDavies]

Considering you have the entire range from 1.254 already allocated with that mask (255.255.255.0 gives you 254 hosts)but are actually only using part of the range you can just change the starting address that your scope starts leasing from and reserving those new addresses and it won't cause any issues.

It would be different if you were using beyond /24 but then if you were you wouldn't be starting with 10.0.0.100 anyway.

Simon

The real world is not about exam scores, it's about ability.

 

[DgtlLgk]

Thanx for ur post.Well.......actually my issue is a little bit mess(that's the way i found them).Lets say ips before and after my pool are assign statically.So i cant change start/end of my pool.Is there a way that i can add those free ip to existing or new DHCP pool?

 

[SimonDavies]

There shouldn't actually be any issues with you assigning those already assigned addresses to the machines that have them, all you need to do is take the MAC address of them and assign those addresses to the MAC address.

Once you have the entries in your DHCP server you simply change from statically assigned addresses to DHCP allocated and all of your machines (including servers) will get their addresses from DHCP. That way in the future if you make any changes to say DNS, WINS etc you only need to change it on the scope rather than going to individual machines.

Simon

The real world is not about exam scores, it's about ability.

 

[DgtlLgk]

I........dunno.............thanx a lot dude.

 

[SimonDavies]

Sorry if it looks vague, I spent 35hours in the office over the weekend implementing AD (before Sunday we were an NT4 house, I was contracted in to bring the company into the modern age).


Anyway now that I am a little more awake (and not distracted).

Being as you are using addresses from the same subnet (ie 10.0.0.1 - 10.0.0.254) you can safely add the addresses that are currently statically assigned to your scope, all you would need to do is set those assigned addresses as reserved to the MAC address of the NIC. That way you have an increased scope and it makes future change management a lot easier (ie you don't have to go to each server to make a change).

You just need to know that you need to get a hold of the MAC address for every single machine before starting the work otherwise you run the risk of duplicate IP addressing.
The only potential way out of that risk (and assuming you don't have new machines joining in the mean time) is increasing the DHCP lease time to something like 2 weeks, make the existing scope larger (ie including all of the addresses) and creating the reservations during that time, that way you could do the work over time rather than approaching it big bang.

Simon

The real world is not about exam scores, it's about ability.

 

[stfaprc]

hmm, can a DHCP be setup so that it would -not- give an ip address to a range (or list) of MAC addresses? ie: ignore any request from an ip phone starting with "03

 

[SimonDavies]

By rights your phone should be on a seperate vlan anyway, but yes you should be able to do this by using DHCP Class Options.

http://support.microsoft.com/kb/240247

has more information on it.

Simon

The real world is not about exam scores, it's about ability.