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Linux iptables: Port Redirection Example

How do I redirect 80 port to 8123 using iptables?
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Q. How do I view active connections with PF firewall under FreeBSD / OpenBSD UNIX operating system?
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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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