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iptables is the userspace command line program used to configure the Linux 2.4.x and 2.6.x IPv4 packet filtering ruleset. It is targeted towards system administrators. Please, when asking a question about iptables, add the output from the following command: iptables -L -v -n

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For load balancing purposes, occasionally our servers forward requests to a different port; The default port for our service is port 5000. This is the code used: iptables -t nat -A PREROUTING -p tcp … , existing connections remain connected to port 5000, as displayed by netstat. My question is, how do I force this iptables rule to immediately apply to all connections, both new and existing (established) - without dropping all connections first? Thanks in advance …
asked Feb 6 '14 by Joni Chicago