ISP Backbone simulation

Is there a way to configure the cisco1841 with 2 F/Ethernet ports to simulate two public IP come from 2 different ISP (different subnet).

I actually want to use two more router to connect to these public IP and configure LAB test for site-2-site and remote access vpn, thanks for any advise..
:roll:

Hi.

of course you can, I understand you simply want to put public ip address to a two fastethernet 1841 router interfaces and connect other routers respectively to each 1841 ethernet interface to route encrypted traffic.
of course you can because it is a lab you can also mix the routing of private and public network adressing.

yes, but how? if I configure static route on these 3 router then it become a whole logical network, both end private subnet behind the edge router all can see eachothers.

what I want is to simulate the two public IP come the 1841 F/Ethernet interface like its come from the Public Internet (something like it come from two different ISP), possible ?