ISDN Backup on VPN Routers

ISDN Backup on VPN Routers

Post by nortel use » Tue, 20 Jun 2006 21:32:50

I am having a number of issues using a BRI ISDN Card in a Nortel 1100
VPN Router.

The card is to be used as a backup interface so that when the primary
link (VPN via Ethernet Port 1) fails the ISDN should kick in and data
be routed that way.

I am having quite a few problems with configuring this, can get the
ISDN to trigger (See the trigger activate and makes a ISDN Connection)
but I dont seem to be able to get data over the backup link.

Test is send a extended ping to Remote LAN, unplug cable from LAN 1,
ping stops responding, see ISDN Trigger come up but still no responce
to ping. If I try to ping the ISDN Interfaces I get intermittent
responses (No real pattern, may mis 7 pings then reply).

I have turned off the firewall and I am using the basic allow all
filter but still no luck.

Has anyone had similar problems or could anyone point me in the right
direction of where I could look to see why this isnt working.


1. SnapGear firewall, ADSL router and backup ISDN router

2. VPN to 2K3 Server and ISDN Router?

I'm trying to set up VPN so employees can access our network from home.

An ASCII map of our network:

ISDN Router <--set up as a DHCP server with a ONE IP-wide scope (For the
Server <--two network cards, one to the ISDN Router, one to the hub/employee

How do I set up the VPN connection with this kind of setup? Do I make the
outside computers connect to the public IP Address at the ISDN router? How
do packets then make it to the server, to authenticate connections, etc?

Is it even possible?

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