doc/stats/conntrackd.conf

#
# General settings
#
General {
	#
	# Enable systemd support. If conntrackd is compiled with the proper
	# configuration, you can use a systemd service unit of Type=notify
	# and use conntrackd with systemd watchdog as well.
	# Default is: off
	#
	#Systemd on

	#
	# Set the nice value of the daemon. This value goes from -20
	# (most favorable scheduling) to 19 (least favorable). Using a
	# negative value reduces the chances to lose state-change events.
	# Default is 0. See man nice(1) for more information.
	#
	Nice -1

	# 
	# Select a different scheduler for the daemon, you can select between
	# RR and FIFO and the process priority (minimum is 0, maximum is 99).
	# See man sched_setscheduler(2) for more information. Using a RT
	# scheduler reduces the chances to overrun the Netlink buffer.
	#
	# Scheduler {
	# 	Type FIFO
	# 	Priority 99
	# }

	#
	# Number of buckets in the caches: hash table
	#
	HashSize 8192

	#
	# Maximum number of conntracks: 
	# it must be >= $ cat /proc/sys/net/ipv4/netfilter/ip_conntrack_max
	#
	HashLimit 65535

	#
	# Logfile: on (/var/log/conntrackd.log), off, or a filename
	# Default: off
	#
	#LogFile on

	#
	# Syslog: on, off or a facility name (daemon (default) or local0..7)
	# Default: off
	#
	#Syslog on

	#
	# Lockfile
	# 
	LockFile /var/lock/conntrack.lock

	#
	# Unix socket configuration
	#
	UNIX {
		Path /var/run/conntrackd.ctl
		Backlog 20
	}

	#
	# Netlink socket buffer size
	#
	NetlinkBufferSize 262142

	#
	# Increase the socket buffer up to maximun if required
	#
	NetlinkBufferSizeMaxGrowth 655355

	# 
	# By default, the daemon receives state updates following an
	# event-driven model. You can modify this behaviour by switching to
	# polling mode with the PollSecs clause. This clause tells conntrackd
	# to dump the states in the kernel every N seconds. With regards to
	# synchronization mode, the polling mode can only guarantee that
	# long-lifetime states are recovered. The main advantage of this method
	# is the reduction in the state replication at the cost of reducing the
	# chances of recovering connections.
	#
	# PollSecs 15

	#
	# Event filtering: This clause allows you to filter certain traffic,
	# There are currently three filter-sets: Protocol, Address and
	# State. The filter is attached to an action that can be: Accept or
	# Ignore. Thus, you can define the event filtering policy of the
	# filter-sets in positive or negative logic depending on your needs.
	#
	Filter {
		#
		# Accept only certain protocols: You may want to log the
		# state of flows depending on their layer 4 protocol.
		#
		Protocol Accept {
			TCP
			# UDP
		}

		#
		# Ignore traffic for a certain set of IP's.
		#
		Address Ignore {
			IPv4_address 127.0.0.1 # loopback
			# IPv6_address ::1
		}

		#
		# Uncomment this line below if you want to filter by flow state.
		# The existing TCP states are: SYN_SENT, SYN_RECV, ESTABLISHED,
		# FIN_WAIT, CLOSE_WAIT, LAST_ACK, TIME_WAIT, CLOSED, LISTEN.
		#
		# State Accept {
		#	ESTABLISHED CLOSED TIME_WAIT CLOSE_WAIT for TCP
		# }
	}
}

Stats {
	#
	# If you enable this option, the daemon writes the information about
	# destroyed connections to a logfile. Default is off.
	# Logfile: on, off, or a filename
	# Default file: (/var/log/conntrackd-stats.log)
	#
	LogFile on

	# If you want reliable event reporting over Netlink, set on this
	# option. If you set on this clause, it is a good idea to set off
	# NetlinkOverrunResync. This option is off by default and you need
	# a Linux kernel >= 2.6.31.
	#
	# NetlinkEventsReliable Off

	#
	# Enable connection logging via Syslog. Default is off.
	# Syslog: on, off or a facility name (daemon (default) or local0..7)
	# If you set the facility, use the same as in the General clause, 
	# otherwise you'll get a warning message.
	#
	#Syslog on
}