Any idea where can I get a freware to monitor the network traffic in my department? The best is this tool can store the log files. Thanks!
To add to that, I have always used Trinux (trinux.sourceforge.net). It's basically all the linux network tools clumped together. It's pretty sweet and flexible. A bit of a learning curve if you aren't familiar with all the tools or linux.
Thanks to all of you for your information!
you can use ipcad - IPCAD - IP traffic accounting daemon download | SourceForge.net
this tool can sniff interface (via libpcap,bpf,ulog,libipq ) and dump statistic into dump-file or export it via rsh for billing systems (for example www.netup.biz).
Or you can use - fprobe download | SourceForge.net. This tool do the same as ipcad but export via netflow (cisco's protocol).
OK! You can use software iptraf. This is small tools to view status of network and more: