Let me start by saying that I am very inexperienced with Cisco routers. I have two remote users (Howard and Gary - me) who dial into our central site which has an 801 ISDN router. Originally, one remote user had a 761 router and the other an 801. A couple of years ago we switched to using terminal adapters (Xircom) and are now using Eicon USB adapters. The dial up used to work OK with the TAs (and at one time there was a third user, GaryM).
For application reasons, both remote PCs need fixed IP addresses and the central network uses only static IP addresses. This used to work OK and the central 801 dials back.
Now what happens with both remote PCs (which are the same hardware/OS) is that with the IP address (of say) 10.0.1.6, the remote PC dials up, authenticates (as Gary-TA, e.g.) and hangs up waiting for the dial-back, which then occurs; however the connection is then dropped immediately with the connection being refused by the server.
If I set the remote PC to "Obtain IP address automatically", on dial-back, the IP address 172.16.0.2 is assigned, and is accepted. The connection holds, but unfortunately, none of my central machines know anything about 172.16.0.2.
I don't know what's caused this. Changes that I can think of between it working and now have been:
Your router is still configured as though there is a router on your remote sites between the central router and the remote PCs. You have the network 10.0.1.0/24 at Gary's house and 10.0.2.0/24 at Howard's. The easiest way to change the central router to reflect the fact that Gary and Howard no longer have routers on their sites is to enter the following commands:
ip address 10.0.0.1 255.255.252.0
no dialer map ip 172.16.0.4 name Gary-TA class gadc
no dialer map ip 172.16.0.5 name Howard-TA class gadc
no dialer map ip 172.16.0.6 name GaryM-TA class gadc
no dialer map ip 172.16.0.2 name Gary-801 class gadc broadcast
no dialer map ip 172.16.0.3 name Howard-761 class gadc broadcast
dialer map ip 10.0.1.6 name Gary-TA class gadc
dialer map ip (Howard's IP address) name Howard-TA class gadc
These new dialer maps reflect the fixed IP addresses on Gary's and Howard's PCs. The ip subnet-zero command will allow the use of the address space 10.0.0.0/22
I managed to try the connection out last night and it worked fine - many thanks.
One thing that was a bit puzzling though was that Howard also dialled in last night; he tried it with his new notebook and whilst he managed to get in with IP address 10.0.2.2 (which was the IP address used in the dialer map command), he had application problems and so went back to his old notebook. It has IP address 10.0.2.1 and so I expected it to be rejected - it wasn't! Any ideas why?
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