DHCP Scope has free IPs, but not using them

  • Thread starter Thread starter Guest
  • Start date Start date
G

Guest

SBS 2000, single server network.
I am constantly getting this in the system log:
Scope, 10.0.0.0, is 100 percent full with only 0 IP addresses remaining.

I have not enlarged the DHCP range, but it is already 90 addresses, and we
only have about 60-70 total devices in the company.

I just changed RAS on the server so that it is using a couple of static
addresses outside the DHCP range, so I am back to only 89% for now, but I
expect it to fill up again.

Why does the DHCP server seem to ignore unused addresses within the DHCP
range? When I look at the current leases, it skips around a lot, for
instance, 10.0.0.151, 154, 155, 158, 160, 166, 171, 172, etc.

There are only 2 reserved addresses within the range.

Can anyone help me out here? Thank you!
 
I've already cleared the RAS leases, but even before I did that, there were
lots of unused addresses in the pool.
 
After going in and reconciling/verifying the scope, when I look in DHCP,
under leases, I showed the whole range full, but only about half were "real"
leases. The rest just had the IP address for a name, instead of
device.domain.com, and the MAC address is funky, like 31302e302e302e31393100.

The next address would have the same MAC address, but incremented by 100,
and so forth.

I tried deleting about 20 of these from the leases, after verifying that
there was no real device at that address, but the DHCP range still warns as
100% full.

The ones I deleted from the leases have not returned.

As far as I know, everyone is getting an IP address, but there haven't been
any new devices added to the network since I started here, and I'm about to
add 7 new PCs, so I'm concerned.

This is weird. Can anyone shed some light?

Tnank you!

Andrei Ungureanu said:
if it will fill up again try to see who is using additional ip addresses and
identify the machines by MAC addresses.


--
Regards,
Andrei Ungureanu
www.eventid.net
Test our new EventReader!
http://www.altairtech.ca/eventreader/default2.asp?ref=au





SBS 2000, single server network.
I am constantly getting this in the system log:
Scope, 10.0.0.0, is 100 percent full with only 0 IP addresses remaining.
Click to expand...
I have not enlarged the DHCP range, but it is already 90 addresses, and we
only have about 60-70 total devices in the company.
Click to expand...
I just changed RAS on the server so that it is using a couple of static
addresses outside the DHCP range, so I am back to only 89% for now, but I
expect it to fill up again.
Click to expand...
Why does the DHCP server seem to ignore unused addresses within the DHCP
range? When I look at the current leases, it skips around a lot, for
instance, 10.0.0.151, 154, 155, 158, 160, 166, 171, 172, etc.
Click to expand...
 
Back
Top