I have a C++ Program to sniff each and every packet that crosses my linux box. However i need to now get my linux box to listen to every traffic in my network. I could buy a managed switch and set up port spanning, but i aint paying 200+ £'s for a switch and plus gives me a chance to learn.

My Network

                                            +---------Computer A
                                            |
Internet-----Router------Switch-------------+---------Linux Box
                                            |
                                            +---------Computer B

Proposed Network

                                            +---------Computer A
                                            |
Internet-----Router------Linux Box--------Switch
                    eth0^         ^eth1     |
                                            +---------Computer B

How would i setup this in linux. Do i just configure both the ethernet on different IP Address on the same network. Or am i completelly on the wrong track

My System

• Fedora 13.

Thanks