Linux - NetworkingThis forum is for any issue related to networks or networking.
Routing, network cards, OSI, etc. Anything is fair game.
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Hi all. This is my first post here and I hope I am not re-opening something old. I want to build a Linux machine that sits between my gateway device and my cable modem and logs all activity in and out of my building. Primarily I just want to see where all the bandwidth is going (like a combined 320 gig in August). Is there a way to do this that does not involve great expenditures of either money or time? I have lots of parts lying around with which make a fairly good machine and I have been using Linux for a bunch of years now. Desktop is not a necessity, I can use a terminal just fine.
Thanks for the reply. I think a clarification is in order. What I really need to know is how to do this or do I even have to do this to get the information I want. Since all my switches are, well, switches I can't just plug a system into a port and see all the traffic and since my modem only has one port I can't plug in there either. So, do I need to build a system with 2 network cards and use some software to capture everything? I am sorry if this sounds like a rather simplistic problem but for some reason I just can't get my mind wrapped around it.
Apart from the clarification surprises, in short if you run a packet capture app on a machine with two ethernet devices in bridge mode + promiscuous mode + without assigned IP addresses you should have your traffic pass-tru. Search for "snort inline" to get the idea.
Distribution: K/Ubuntu 12.04/14.04, Scientific Linux 6.3/6.4, Android-x86, Pretty much all distros at one point...
Depending on what kind of router you have, you may be able to flash it to use DD-WRT or OpenWRT and use a plugin for monitoring/logging network traffic.
One such tool, no longer under active development, is wrtbwmon,... a small shell script that can be run on various Linux powered routers. There are other projects referenced on the Google code page for the script;