Free Network Utilities

News	See Also	Recommended Links	Recommended Articles	Reference	Troubleshooting	TCPreplay
ifconfig	ethtool	ndd	solaris route	Linux route command	netstat	Wireshark
ping	traceroute	Solaris Snoop Packet Sniffer	Tcpdump	ngrep	netcat	nettee
nmap	ntop	rsync	snort	Packet Generation Tools	Humor	Etc

Several network utilities are pipable:

In Jan 2007 I added the page about TCP/IP troubleshooting to complement this page

A very good list of free network tools can be found at Top 100 Network Security Tools

Dr. Nikolai Bezroukov

Notes:

This is a Spartan WHYFF (We Help You For Free) site written by people for whom English is not a native language. Some amount of grammar and spelling errors should be expected.
The site contain some broken links as it develops like a living tree... Please try to use Google, Open directory, etc. to find a replacement link (see HOWTO search the WEB for details). We would appreciate if you can mail us a correct link.

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Old News ;-)

[Jan 2, 2008] vnStat

About:
vnStat is a console-based network traffic monitor that keeps a log of hourly, daily, and monthly network traffic for the selected interface(s). However, it isn't a packet sniffer. The traffic information is analyzed from the /proc filesystem. That way, vnStat can be used even without root permissions.
Release focus: Minor bugfixes

Changes:
This release fixes a bug that caused a segmentation fault if the environment variable "HOME" wasn't defined, which in turn caused most PHP/CGI scripts using vnStat to malfunction. Some minor feature enhancements are also included.

[Apr 15, 2007] freshmeat.net Project details for Tcpreplay by Aaron Turner

Tcpreplay 3.0.RC1 (stable)
This release improves OpenBSD, HP-UX, Cygwin/Win32, x86_64, and little endian support. Enhancements were made to allow editing packets with tcpreplay. libpcap detection was improved.

[Mar 24, 2007] freshmeat.net Project details for Tcpreplay

Tcpreplay 3.0.beta13 released

Tcpreplay is a set of Unix tools which allows the editing and replaying of captured network traffic in pcap (tcpdump) format. It can be used to test a variety of passive and inline network devices, including IPS's, UTM's, routers, firewalls, and NIDS.

Release focus: Major bugfixes

Changes:
This release fixes some serious regression bugs that prevented tcprewrite from editing most packets on Intel and other little-endian systems. Some smaller bugfixes and tweaks to improve replay performance were made.

Author:
Aaron Turner [contact developer]

[Mar 3rd 2006 ] freshmeat.net Project details for netrw by Jiri Denemark

netrw 1.3.1

About: netrw is a simple (but powerful) tool for transporting data over the Internet. Its main purpose is to simplify and speed up file transfers to hosts without an FTP server. It can also be used for uploading data to some other user. It is something like one-way netcat (nc) with some nice features concerning data transfers. It can compute and check message digest (MD5, SHA-1, and some others) of all the data being transferred. It can also print information on progress and average speed. At the end, it sums up the transfer.
Changes: A bug causing netread to sometimes end up in an endless loop after receiving all data was fixed.