fw_conntrack - Plugin to monitor the number of tracked connections through a Linux 2.4/2.6 firewall
This plugin must run with root privileges
@@CONFDIR@@/plugin-conf.d/global or other file in that dir must contain:
[fw_*] user root
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 complementary 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/
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