On my 1720 I have a Dial-up ISDN line configured as a DDR backup for my Serial line (See Previous Post).
All works well when I take the serial line down, the ISDN dials up the ISP and connects. I can ping out from the router to addresses on the Internet but packets from the Fast Ethernet interface do not go out.
Running a "ip route command" at the router I see that the "gateway of last resort" (0.0.0.0 .0.0.0.0) is connected to "Dialer0" but a trace route from a machine on my LAN shows that packets stop at the Fast Ethernet interface on the router.
So after that long intro here's my question.
Will ISP's allow traffic out on their networks which is not from an IP address on their network? The obvious answer is no, I think. The network for the Fast Ethernet is 126.96.36.199 x.x.x.x but the network for the ISDN interface is 188.8.131.52 y.y.y.y
Why can't I route packets through do the Dialer0 int?
I suppose you are using private addressing for the workstations on LAN. YOu should be using NAT on the router, to connect to the internet. Your BRI port is getting an IP add from the ISP, which is a public IP and thats the reason why you can reach the internet.
Yes we are using Private IP Addresses on the LAN via Novell BorderManager which is before the router on the LAN side. To be honest I'd rather not change that.
So now I need to figure out how to enable NAT for the BRI0/Dialer0 and FastEthernet0 configuration but still be able to keep my static IP Address on the FastEthernet int so things work for routing to the Serial0 int.
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