Messy DHCP

[Jabulani]

I am not sure what is the best approach to take with this problem.
The DHCP does not appear to be properly set up, leading to numerous IP address conflicts on a daily basis.
Availability is 13%
Lease period is set to Infinite.
Printers are on DHCP
Some servers are on DHCP
Dozens of reservations and none excluded.
I reset the lease period to 2 days hoping it would flush out over the weekend but no such luck since most users leave their machines on all the time. I try to release and renew leases to pick up the new 2 day period but I get error: "Access denied" ??
Can I reconfigure the scope without any visibility to the users and servers or is it better to define a new scope and Can I have two scopes defined with the same addresses if one is inactive?
There is going to be 3 day power down in the building over Easter, will that help to flush the DHCP database?

 

[gunthnp]

never have to scope with the same address check your routers and make sure there updated same with layer 3 switchs they can block acess if there not up to date and what type of dhcp sever are you running some don't met ALL the rfc's on dhcp that tend to make more headacks then need So long and thanks for all the fish.

 

[UNIX72]

You should setup static ip's for the servers and printers excluded them from the dhcp. What OS are you running dhcp?

 

[Jabulani]

I've worked out what's going and have a plan to fix it.
The main problem was that a number of users dial into the network via CISCO 3640 which has a range of addresses reserved for dial-in clients. None of this reserved range was excluded from the scope so it was being allocated to dial-in users via the CISCO and to LAN connected users via NT4 DHCP.

I have now corrected this as well as put all servers on Static and excluded those addresses. Router addressesd have also been excluded. Printer will be put on Static and excluded in the next ? days.

At the end of the Power down I went through and cleared out all indefinite leases from DHCP manager so we are now running at 47% availability instead of 13%. I have left the system on a 8 hour lease period for now until I fix the printers

Thanks again!