D-Link DP-601M Internet Server

[CyberTech]

I've setup internet sharing on a Windows 2000 active directory network. Win 2000 Server running DHCP & DNS and Win 2000 Pro clients.
I'm using a D-Link DP-601M Internet Server to share a dial-up internet connection. The connection needs to be dial-on demand and should disonnect after 15 minutes of inactivity (their ISP bills by the hour).

Everything seems to work ok, except that the connection is being dialled about once every hour even when all the workstations are turned off overnight!

The config is as follows:
Win2K Server - IP 192.168.1.1
Internet Server - IP 192.168.1.254
DHCP assigns workstations IP addresses in the range of 192.168.1.10-99
DHCP assigns DNS server address of 192.168.1.1, and default gateway of 192.168.1.254
Now for the part I don't fully understand yet - On the Server the DNS service is configured to use forwarders (ie. the DNS servers of the ISP), and the box for 'Do Not Use Recursion' is not ticked. (I've also tried ticking this box, and it doesn't seem to make any difference.)

The idea is that when the DNS server receives a query that it can't resolve on its own, it's supposed to forward the query to the ISPs DNS server. I don't want all DNS queries to be forwarded, 'cause this will cause the internet connection to dial-up.

[UsePost2000]

Okay, that sounds like its your problem.
Try setting the DNS as a caching only server.
Hope this helps.

[CyberTech]

Thanks for the suggestion, UsePost2000.

Now, how do I configure a caching only DNS server?

[CyberTech]

Ok. I'm not too sure about the caching only DNS thing, but I'm trying somthing else. I've turned off Zone transfers for all of the forward lookup zones. Hopefully this will prevent the regular internet dial-ups.

Any comments/suggestions would still be appreciated.

[CyberTech]

Nope. That didn't seem to make any difference. It's still dialling out periodically (usually about every hour or so). The ISP log shows that 70 bytes are downloaded and then disconnects after 7 minutes.

Any ideas??