I'm building a linux machine with 2 Ethernet cards in promiscuous mode (with 127 ip_addrs), in order to analyze the network traffic between all our subnettings.
I want to put this machine between the 2 routers as auditing tool. The problem is that I don't want to configure the machine depending on the place to be (routes and so on).
Basically I want FORWARDING, then I think about <ipfwadm> package. The idea is : everything coming from eth0 resend it to eth1 and viceversa!
Is this possible?, and then, How can I do this?