configuring a cisco router for internet access and passthrough to the firewall

i need to configure two cisco 2821 routers (Independent of each other). One will be using DSL for internet access and one will be using cable. Later being used for a T1 but not now. They both need to be configured to let everything passthrough to the firewall. The firewall will be handling NAT. Any good examples or configuration notes for configuring the cisco router?
fina27Asked:
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amoldkelkarCommented:
Following couple of links could be of basic help,

http://www.alliancedatacom.com/cisco-router-configuration-tutorial.asp

This could help you specifically for the DSL part,
http://www.ciscoblog.com/archives/2006/12/configuring_a_c.html

Also take care of the routes properly while routing the specific traffic through VPN and forwarding the other traffic to the gateway.

BTW which firewall r u planning to use? Is it Juniper by any chance?

Thanks
-AK
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fina27Author Commented:
watchguard firebox x1250
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amoldkelkarCommented:
Aha..
So if i am not wrong you can follow for the basic config into the above links i have mentioned for cisco routers.
Plus what you need to do is to put routes on the routers for forwarding the traffic going out to the Firewall.
As well as on firewall you will have to put a route taking vpn if any or directly to the gateway outside.

-AK
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fina27Author Commented:
I'm looking to passthrough the External IPs through the router to the firewall. I don't think you can configure an IP route if both interfaces are the same IP
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fina27Author Commented:
i think i need to do bridging, then set up a bvi interface to manage it
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fina27Author Commented:
i need to bridge a DSL line and a T1 line out two fast ethernet ports. Since I have to issue the no ip address command, i need a way to telnet to it if need be. Thats when the BVI interface comes in. How can I accomplish this?
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