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http://conntrack-tools.netfilter.org/

The userspace daemon conntrackd can be used to enable high availability of cluster-based stateful firewalls and to collect statistics of the stateful firewall use

http://conntrack-tools.netfilter.org/manual.html#settingup

The daemon conntrackd supports two working modes:

State table synchronization: the daemon can be used to synchronize the connection tracking state table between several firewall replicas. This can be used to deploy fault-tolerant stateful firewalls. This is the main feature of the daemon.

Flow-based statistics collection: the daemon can be used to collect flow-based statistics. This feature is similar to what ulogd-2.x provides.

http://conntrack-tools.netfilter.org/

The userspace daemon conntrackd can be used to enable high availability of cluster-based stateful firewalls and to collect statistics of the stateful firewall use