Win2k Server DHCP server reports 100% Addresses In use but should be empty ?

[Stuart Mackie [MCP, MVS]]

Hi. I have just noticed that my DHCP server (running on Win2k Server SP4,
DC, DHCP and DNS) is reporting as being 100% in use (with 21 usable
addresses). But I have checked Address Leases and they are empty, and there
are also no systems on this part of the network yet so no leases could have
been given. From what I can tell everything has been working without
problem for the last few weeks, and it may be releated to a recent update
applied from Windows Update or addition of SP4.

Can anyone suggest where I should begin to resolve this ? I have tried
restarting the system and services but it is adament that all the Addresses
have been leased when they haven't. I could easily increase the number of
available Addresses but I would like to resolve this problem first.

 

[Stuart Mackie [MCP, MVS]]

Hemm, sorry to update this so quickly But I've just exited the DHCP
console and restarted it and it now shows in the Address Leases all the
clients which supposedly have received addresses. But this DHCP server has
no other clients on the network.

I've just noticed that a colleague has switched on one of our Wireless AP's
just as this listing appeared so it may be that the Address Leases are
related to that, although they shouldn't be

 

[Alan Franklin]

I've seen the 100% issue. I my case, it related to enabling Remote Access
via
VPN. The RAS was configured to use DHCP to get its addresses - which
seem reasonable. However, the gotcha was that the Service grabs all the
addresses that it can potentially need as it starts up. So, as I enabled
20 dial-in (VPN) sessions, RAS gobbled up 20 DHCP addresses. When
my normal DHCP client connected it got the no-vacancy message.

This may or may not be what you are seeing. If you are using RAS
(VPN or otherwise), it may be worthwhile dropping the number of
connections. From recollection, I think the default was something
silly like 128.