NAME

fw_conntrack - Plugin to monitor the number of tracked connections through a Linux 2.4/2.6 firewall

CONFIGURATION

This plugin must run with root privileges

CONFIGURATION EXAMPLE

@@CONFDIR@@/plugin-conf.d/global or other file in that dir must contain:

 [fw_*]
  user root

NOTES

ESTABLISHED+FIN_WAIT+TIME_WAIT+SYN_SENT+UDP are the most interesting connections.

The total list also includes SYN_RECV, CLOSE, CLOSE_WAIT, LAST_ACK and LISTEN, but these were not (often) observed on my firewall.

TOTAL is the total number of tracked connections.

ASSURED and UNREPLIED connections are complimentary subsets of ESTABLISHED.

ASSURED is after ACK is seen after SYN_RECV. Therefore ASSURED is plotted but not UNREPLIED.

Note that the plugin depends on the netfilter "conntrack" userspace tool. It comes from http://conntrack-tools.netfilter.org/

AUTHORS

2004.05.05: Initial version by Nicolai Langfeldt, Linpro AS, Oslo, Norway
2004.05.06: Enhanced to count NATed connections after input from Xavier on munin-users list
2011.09.23: Perl version by Alex Tomlins

LICENSE

GPL

MAGIC MARKERS

 #%# family=auto
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