Port forwarding
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High Quality Content by WIKIPEDIA articles! Port forwarding or port mapping is the practice of forwarding a TCP/IP packet in a network address translator gateway to a predetermined network port on a host within a masqueraded, typically private network based on the port number on which it was received from the originating host. The technique is used to permit communications by external hosts with services provided within a private local area network.Port forwarding allows remote computers (e.g., public machines on the Internet) to connect to a specific computer within a private LAN. For…mehr

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High Quality Content by WIKIPEDIA articles! Port forwarding or port mapping is the practice of forwarding a TCP/IP packet in a network address translator gateway to a predetermined network port on a host within a masqueraded, typically private network based on the port number on which it was received from the originating host. The technique is used to permit communications by external hosts with services provided within a private local area network.Port forwarding allows remote computers (e.g., public machines on the Internet) to connect to a specific computer within a private LAN. For example: Running a public HTTP server within a private LAN (port 80) Permitting Secure Shell access on the private LAN from the Internet (port 22)Permitting FTP access to hosts on a private LAN from the Internet (port 21) In Linux kernels this is achieved by packet filter rules in the iptables or netfilter kernel modules. BSD and Mac OS X operating systems use a similar tool named Ipfirewall (ipfw).