Linux router traffic monitoring, how? netflow?

srn.nanog at srn.nanog at
Fri Nov 14 18:38:55 UTC 2014

fprobe is a linux-based netflow probe that uses libpcap (as does tcpdump) and is already in the
ubuntu universe repository. There is an ipv4-only iptables based version too called fprobe-ulog.

For collectors, it looks like the ones already available in ubuntu are nfcapd from nfdump and
flow-capture from flow-tools. For analysis/alerts, cacti with the thold and flowview plugins might
do the job.

On 11/13/2014 09:09 AM, Eliezer Croitoru wrote:
> Hey all,
> I have a tiny linux router based on ubuntu and sometimes I get a
> massive load of UDP traffic because of one of the PCs in the network.
> Usually I handle the situation with a strict block using iptables.
> The main issue is to find it due to the load.
> For now I am monitoring the traffic load using MRTG but it won't
> notify me.
> I can try to use nagios to monitor traffic load for a period of time
> but before I start working on it I want another person opinion and
> options.
> I have seen netflow in the past but never actually used it.
> Thanks in advance,
> Eliezer

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