What is the nf_conntrack_tcp_loose or ip_conntrack_tcp_loose setting for?

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Issue

What is the nf_conntrack_tcp_loose (RHEL6) or ip_conntrack_tcp_loose (RHEL5) setting for?

Environment

Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 5
iptables connection tracking firewall
(Optional) Proxy or reverse proxy software

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