Ubuntu and advanced networking question :)

[prebs]

OK, so here is my q,

I have three network interfaces on my box. Lets call them A, B and C.

I want to place my box in-line within our corporate network, so that traffic from LAN goes into interface A and is directed out again through B. So essentially making a Switch. And the last interface is for management of the box it self.

Is this possible?


LAN ---> [[ int . A -- int . B ]] --------> Firewall --> Internet

Could i configure the interfaces so that you basically make a software based TAP?
Or on other words "Cut the cable" and putting my box in the middle....


Any help and linux commands would be greatly appreciated.

-- p.

[HROAdmin26]

The machine can be transparent to the IP layer by making it a bridge between interface A > B.

Or it can be a "router" by forwarding packets between the networks that A and B are attached to (usually with iptables.)

You can Google for bridging or routing examples/tutorials/books.

[prebs]

can i passivly sniff the network traffic if its in a bridge mode? Thanks for the reply

[HROAdmin26]

Google > linux bridge snort