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DHCP losing bindings

Posted on 2008-06-12
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Last Modified: 2010-08-05
On a number of SBS 2003 boxes I maintain, I am finding that DHCP loses its bindings to the network adaptor every time they reboot. When trying to re-assign the network adaptor, they will not allow it - I put the tick in the box but when I look in there again it has disappeared!

As a work around, I am having to change the servers IP address through server management - then because of the way we have our network I have to change it back again! This only takes 3-4 mins but is annoying. Doing this automatically resets the binding.

Any ideas what is going on?
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Question by:Rabbit80
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by:waynewilliams
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Can you please explain what you mean by "because of the way we have our network"?
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by:Rabbit80
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Sorry - we have a number of static IP addresses for various devices some of which use the server as a gateway to the internet - to have to update all these every time I have to change the server IP address would be time consuming. The point is that the server should not be losing its bindings.

I have checked that the problem does not lie with any of our other devices by having a single PC connected via a hub - nothing else on the network at all. The server only loses its binding when it is restarted - ie after windows updates. It does not lose it any other time.
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by:waynewilliams
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Ok.  You say you use the server management console to change the IP address, do you change it to a different address on the same subnet or a totally different subnet?

Also, when you change the IP on the server back to what it was, do you also use the server management console to do that?

Have you tried removing and re-installing DHCP? This is quite easy to do as you can backup the current DHCP database before you remove the service and then restore it after you have re-installed.
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by:Rabbit80
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I have to change the IP to a different subnet - ie I change from 192.168.1.1 to 192.168.2.1. Changing to 192.168.1.2 does not work! I use the server management console both times to change the IP address.

I have not yet tried re-installing DHCP but this is something I could try later on this week when things are a little quieter.

The thing is, I look after a couple of servers for some of our customers which are doing the exact same thing - the hardware is completely different though so I am able to rule hardware out. Could this either be i) a mistake I have made somewhere in the configuration of these systems or ii) a bug with SBS 2003?
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by:waynewilliams
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I have installed over 300 SBS systems and have never seen this issue.  Looks like an issue with DHCP rather than the OS so re-installing DHCP may help.
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by:Rabbit80
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Its now happening on yet another server that I maintain - could I doing something wrong during setup / is something set wrong somewhere?
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by:ChiefIT
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I have no idea what causes this, but the fix for a client was to uninstall TCP/IP and reinstall it in the bindings.
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by:waynewilliams
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Re-installing TCP/IP is a bit drastic on a server!!  I would re-install the DHCP service first.
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Rabbit80 earned 0 total points
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This problem now seems to have vanished - I did nothing - I suspect windows updates may have been the cause but I dont know which one!
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