>Thanks for the response. At the moment I'm not too concerned with individual machines that generate traffic and thus hold the connection - I can deal with those later. As mentioned, at the moment the router keeps the line up even when it is physically detached from the hub that connects it the local LAN. Also, since the traffic is occurring beween the router and the IDSN connection/ISP I don't know if there is any sniffer I can use to monitor this. Again I don't know if this exchange is initiated by the router here or at the ISP or whether this is, in fact, responsible for the problem. I set up the router using the Cisco 'Fast Step' utility and am looking at the resulting setup from the Monitor utility. Maybe I'm going to have to start digging using the console interface. Any further suggestions would be welcome.
As I said, I didn't learn DDR (1) yet, so I don't know the specific configuration commands.
In general terms, the setup utility is fairly limited.
If you don't know much about configuration, perhaps Cisco ConfigMaker can help. This is a free download (you have to fill out a form, indicating how you plan to use it), and it seems to support many Cisco technologies. I don't know whether it specifically supports ISDN & DDR. This would generate the relevant commands, and upload them to the router.
On the other hand, I am taking a quick look at the relevant chapter in the textbook. The following seem to be relevant commands:
show dialer: Displays diagnostic information for DDR.
dialer idle-timeout: Define timeout for connection. In seconds.
dialer-string: Specify phone number to dial.
debug dialer: Show information about packets received on a dialer interface. Note: As with all debugging commands, don't forget to issue no debug ... or no debug all when you are finished. Otherwise, the router will have unnecessary work to do.
There are several other commands listed; I will really have to study the relevant chapter in more detail, to understand the details.
(1) DDR: Dial on-Demand Routing
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