Static IP conflict

Dear Experts
I have a strange issue going in my business network. Its been happening since I started this job. When I assign a Static IP to a any device i.e. printer , w/s or even to my vCenter Server, it looses that IP and I notice I cannot connect to this device anymore. Some other device on my network has taken this IP. What should I check in my DNS / DHCP? I really resolve this.
Some help would be highly appreciated.

Thanks in advance.
itcsproAsked:
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newimagentCommented:
If you are using windows servers to handle dhcp review the scope for each server. At a high level that will provide you the IP ranges that you should not be using when assigning static IP's.

DHCP > Server > IPv4 > Scope > Address Pool

You will need to review this on each server that's running a DHCP server. You can use the mmc to connect to the other servers to do it all from one place.

If you have something else serving DHCP the same principle applies the method you use to find the info will be different though.
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rindiCommented:
Use your DHCP server to reserve IP's to those devices that need static IP's. Don't assign the ip directly on the device,as there you can make mistakes and assign an IP that is already used
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Fred MarshallPrincipalCommented:
How did you decide which IP to assign?  How did that IP relate to the DHCP range?
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itcsproAuthor Commented:
Today I just picked one that was available out of my DHCP pool and put in network adapter ip4 settings. Later today I found this IP has been taken by an unmanaged switch.
I also enabled IP conflict check to 2 on DHCP from 0 but that doesn't seem to be working either.
I have limited knowledge with IP stuff sorry.
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Trent SmithCommented:
Are you putting a reservation into the DHCP server so that the DHCP server knows that it is not allowed to use that address.  Just because it falls into the range your server won't know that you already assigned the address.   Have you thought about using DHCP reservations rather than statically assigning the addresses?
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Fred MarshallPrincipalCommented:
OK.  Well, you need to pick one that isn't in the DHCP pool at all nor a reserved IP for DHCP.  
And, you need to pick one that hasn't been assigned as a static IP manually by anyone.  
The suggestion that you set all the static IP addresses with DHCP reservations is a good one as then you'll have a list in the configuration for DHCP.
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itcsproAuthor Commented:
Thanks to everyone who took the time to respond to my query.

Good Day!
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