Open Source Linux network analyzer
Which are there? What features do they offer?
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Which are there? What features do they offer?
What exactly do you need?
Can't believe nobody mentioned tcpdump. Click on the link to see the list of features
ntop is a solution that has been around for a while, can be extended with plugins. Here is a short how-to.
A few more:
A missing tool from the list is ettercap
. A text-based tool to analyse a subnet and perform active or passive scans of the subnet. It can also monitor packets and display streams.
If you need a network traffic analyzer you can use tshark (it's the console version of wireshark).
MRTG for nice pretty pictures and graphs (management p0rn) via SNMP monitoring. does everything i need, but if u dont list your requirements its quite hard to guess what you want.
for reconaissance / mostly real time analysis:
If you need a network intrusion IDS/IPS tool, Snort is one such open source tool.