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DHCP IP's not releasing in Win2008

W

willieDee

Junior Member
I am using win 2008 and have over 80 pc's on the network. The problem that I have is that my DHCP server has over 200 op address to lease out but for some reason it says that I have only 11 left. When I look at the scope statistics I have a total of 235 addresses and it says there is 224 in use and there is only 80 pc's connected to the network. How do I fix this issue?

Willie
 
Something is grabbing addresses. Open or unsecure wireless? People pluggin machines in willy nilly? Long lease time? 24 hours is fine. There are also "hacking" tools that let you deplete DHCP scopes.
 
Reduce the lease duration. This is done on the scope properties.

edit: if that doesn't solve your problem, then, like Spidey said, some other devices are grabbing IPs on your network. You said you have 80 PCs...what about other network devices?
 
Last edited:
Have you looked at the actual leases? Do all 200+ correspond to computer names at your location (with some being duplicates)?
 
I do not have any wireless routers. If this is a hacking tool how do I know and how do I get rid of it.

My lease duration is set to 2mins.
 
willieDee said:
I do not have any wireless routers. If this is a hacking tool how do I know and how do I get rid of it.

My lease duration is set to 2mins.
Click to expand...

Set your duration longer than that....I would make it at least a day.

You're going to need to look at the leases and verify that each client listed is supposed to be on your network.
 
When I look at my address leases I only see 80 addresses being used. But in the statistics it says that I am using over 200.
 
Are you 100% sure that someone has not gotten "creative" and added their own wireless access point? Typical sign of this is DHCP leases that are there but missing the names or have strange names. Do you actually recognize all of the names in the list.
 
default dhcp on windows is infinite - change it.

if you have no guests on your network (you shouldn't) then just use lease reservations and keep a few (20?) ip's for new mac addresses
 
willieDee said:
When I look at my address leases I only see 80 addresses being used. But in the statistics it says that I am using over 200.
Click to expand...

That might mean everything is normal. Maybe the statistics saying 200 are being used just means you have 200 IP addresses in the pool.
 
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