If you are like me you spend a ton of time wondering how data gets to and from servers, what they say to each other, and where it all falls apart when you are in the most critical moments of your project. No fail you will be seconds away from finishing your most important project and blam! you network will stop responding, or you can't find the server that is supposed to never go away. What to do? Who do you call? The answer, look at the problem yourself.
That is where Network Flow Analysis comes in handy, as a quick, and very thorough explanation of network flows (the movement of datas) and how to interpret them.
Network Flow Analysis is written by Michael W. Lucas, a network/security engineer who keeps getting stuck with network problems nobody else wants to touch. He is the author of the critically acclaimed Absolute FreeBSD, Absolute OpenBSD, Cisco Routers for the Desperate, and PGP & GPG, all from No Starch Press.
Michael brings a ton of experience to the table, and he writes in probably the only way possible when writing about such boring subjects. Oh come on you know network flows are boring! Michael keeps things moving and only ever gets boring for short periods, and only exactly when absolutely a necessity.
Network Flow Analysis covers everything from identifying network, server, router, and firewall problems to finding defective or misconfigured software, as well as finding virus-spewing machines (even if they're on a different continent), and more!
This book is worth it's weight in gold, especially if you have to deal with a shoddy ISP who always blames things on your network. You know who I am talking about Qwest.
Go ahead and pick up a copy of Network Flow Analysis, from No Starch Press, and dig into how to use flow-tools and find out what is really happening on your network at all times.