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DHCP Problem with Westell 2200 DSL Router

I am using the "Single Static IP" feature of my Westell DSL Router to expose one of the computers in my network to the Internet. This has worked fine for 4 months. I am using DHCP on all 5 computers in the network. The others get an IP address from the private LAN range ( -, while this server gets the external IP address, which is whatever the Verizon DHCP server assigns to my router.  Since today, the exposed computer's DHCP lease is only good for 5 minutes and after that it cannot renegotiate a lease and switches to a static IP address. Here is the error in the Windows XP event log:

Your computer was not able to renew its address from the network (from the DHCP Server) for the Network Card with network address 0006298924F8.  The following error occurred:
The semaphore timeout period has expired. . Your computer will continue to try and obtain an address on its own from the network address (DHCP) server.

Since I did not make any changes to my network configuration, I believe that the problem could be related to a reconfiguration of the Westell Router that was initiated by my provider. I could not find anything in the router's config pages that would let me change or view the settings for the DHCP service of a "Single Static IP" client, only for regular clients, where it is set to 5 days. Can someone confirm that a provider would actually go that far to stop customers from exposing a server?
Technically, I have no other explanation, but it still seems far-fetched to me.

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If you are using Dynamic IP's from your ISP, how are you 'exposing' your server to the internet since the IPs change..??   Are you using Dynamic DNS..???  

If so, why don't you just configure your server with a static address and then port forward to the server from the router..??   This would certainly add security to your internal LAN and the server...

Just a thought..

fertigAuthor Commented:
When the DSL modem gets a new IP address, it does not automatically propagate down to the server. I have to reboot to get it back online with the new IP, which happens on the 5th of every month.
I tried to use port forwarding when I set up the initial configuration, but could not get it to work. The server also hosts the Windows Media video stream of my driveway camera, so it does not affect just HTTP.
You are certainly right, I will have to look into this again.
Yea..  that is one of the various problems with DSL..  One of the ways the ISPs try to stop you from advertising these servers...   If this is 'mission critical' to you, then I would suggest that you upgrade your service to Static IP's..  This is what I did at my office (although I have redundant connections from 3 ISP's)..   Although a little more expensive, I have 5 static IPs and use port forwarding for the server I advertise, which is located in a DMZ for security...  
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