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Linux iptables: Port Redirection Example

How do I redirect 80 port to 8123 using iptables?
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BSD PF Firewall: Displays Active Packetfilter States And Rules

Q. How do I view active connections with PF firewall under FreeBSD / OpenBSD UNIX operating system?
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Display the Natted / Routed Connections on a Linux Iptable Firewall

Q. I've Linux box acting as software router (natted) for over 100 computer connected via LAN. Regular netstat command is not displaying the list of all natted connections. How do I find out connections managed by netfilter / iptables which comes with the Debian 4.x system?
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