Here's a diagram of my current network setup: http://ccgi.pendulum.plus.com/diag.gif
What I want to do is log all traffic that goes in and out of the target machine.
I'll consider all options (including buying extra equipment if necessary).
Preferably, I would use my server to log traffic in some way (because it's on 24/7), but the solution must not affect the working of my server (httpd/ftpd etc).
Preferably, I'd like to be able to NOT log traffic from my personal computer, or my server, because it'll make the log files big and harder to skim through.
Preferably, I would rather not have to change the setup of the target computer (e.g. by configuring it to use a proxy). Although I could, and I'll listen to any advice on that.
My router does not appear to offer any real logging facility. It's a DG834 (not the wireless version).
I have said "preferably" above, but I'd like to make it clear that I'm not meaning to set any requirements there, I'll listen to any solution! I'll give the points to the solution I choose as being the best one for me, or I may split them if there is more than one good solution. Questions welcome.