We have a pix firewall on our network which acts as the gateway to the internet. We have however recently deployed an ISDN router on the network which will send specific traffic from an application out over an ISDN line. What I need to be able to do is route any traffic to a specific address 126.96.36.199 to the new router 192.168.0.5 as opposed to it going out via our pix. I would be grateful for any help on how to go about this.
we are using a pix 515
I think your diagram basically confirms what i was saying. You have a pix acting as your default gateway for all your clients. So when your Jade client sends traffic which is meant to go over the ISDN line it first goes to the inside interface of the pix. You then have a route on the pix to say to get to the remote network go back out of the pix inside interface and to the 2800.
If i have interpreted this correctly and your pix is running version 6.x then this won't work. If you are running v7.x you can do this - it's called hairpinning.
If you can't do hairpinning you have a couple of options
1) Transfer the pix inside interface IP address to the 2800 and then add a default route on the 2800 to point back to the pix inside interface. This would mean you don't have to update the clients default-gateway but without knowing your full setup it may cause other problems.
2) Add a host specific route on each client that needs to talk down the ISDN line. If it's windows you can add in a cmd prompt window
route add "remote IP" mask 255.255.255.255 "2800 ethernet interface"
Hope this makes sense.