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Linux: Block Port With IPtables

How do I block port number with iptables under Linux operating systems?
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Linux iptables: Port Redirection Example

How do I redirect 80 port to 8123 using iptables?
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I've root ssh access and need to add / delete a few IP address on fly using the IPtables command via local shell script. How do I add or delete an IP address remotely over the SSH session under CentOS / Redhat / RHEL / Debian / Ubuntu Linux?
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Linux: Iptables Forward Multiple Ports

How do I forward multiple ports using Linux iptables based firewall?
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How Do I Block an IP Address on My Linux server?

How do I block an IP address or subnet under Linux operating system?
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