Shulou(Shulou.com)06/03 Report--

Introduction to IPTABLES

IPTABLES is an IP packet filtering system integrated with the latest version 3.5 Linux kernel. If a Linux system connects to the Internet or LAN, a server or a proxy server that connects LAN to the Internet, the system facilitates better control of IP packet filtering and firewall configuration on the Linux system.

Iptables-I INPUT-p tcp-- dport 8090-j ACCEPT # is inserted in the first position of the chain

Iptables-An INPUT-p tcp-- dport 20-j ACCEPT # appends to the end of the chain

-I: insert, insert

-A:append, append

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